JAMB UTME - Mathematics - 1994

Solve for x and y $\left(\begin{array}{cc}1& 1\\ 3& y\end{array}\right)$$\left(\begin{array}{c}x\\ 1\end{array}\right)$ = $\left(\begin{array}{c}4\\ 1\end{array}\right)$

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$\left(\begin{array}{cc}1& 1\\ 3& y\end{array}\right)$$\left(\begin{array}{c}x\\ 1\end{array}\right)$ = $\left(\begin{array}{c}4\\ 1\end{array}\right)$ = x + 1 = 4
x = 4 - 1
= 3
3x + y =1
3(3) = y = 1
= 9 + y = 1
y = 1 - 9
= -8

Evaluate $\frac{lo{g}_5\left(0.04\right)}{lo{g}_{3}18-lo{g}_{3}2}$

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To evaluate the expression, we need to use the properties of logarithms. First, we can simplify the expression inside the parentheses of the logarithm: log5(0.04) = log5(4/100) = log5(4) - log5(100) = log5(2^2) - log5(10^2) = 2log5(2) - 2 Next, we can simplify the second part of the expression: log318 - log32 = log3(18/32) = log3(9/16) = log3(3^2) - log3(2^4) = 2log3(3) - 4 Substituting these simplified expressions back into the original expression, we get: 2log5(2) - 2 - (2log3(3) - 4) Simplifying further, we get: 2log5(2) - 2 - 2log3(3) + 4 Combining like terms, we get: 2log5(2) - 2log3(3) + 2 Now, we can plug in the values of log5(2) and log3(3) using a calculator: log5(2) ≈ 0.4307 and log3(3) = 1 Substituting these values, we get: 2(0.4307) - 2(1) + 2 ≈ 0.8614 - 2 + 2 ≈ -0.1386 Therefore, the answer is -1, since it is the only option that is negative.

Find the values of p and q such that (x - 1)and (x - 3) are factors of px3 + qx2 + 11x - 6

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Since (x - 1), is a factor, when the polynomial is divided by (x - 1), the remainder = zero
∴ (x - 1) = 0
x = 1
Substitute in the polynomial the value x = 1
= p(1)3 + q(1)2 + 11(1) - 6 = 0
p + q + 5 = 0 .....(i)
Also since x - 3 is a factor, ∴ x - 3 = 0
x = 3
Substitute p(3)3 + q(3)2 + 11(3) - 6 = 0
27p + 9q = -27 ......(2)
Combine eqns. (i) and (ii)
Multiply equation (i) by 9 to eliminate q
9p + 9q = -45
Subt. $\frac{27p+9q=-27}{-18p=-18}$
∴ p = 1

If a = 1, b = 3, solve for x in the equation $\frac{a}{a?x}$ = $\frac{b}{x?b}$

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$\frac{a}{a?x}$ = $\frac{b}{x?b}$
$\frac{1}{1?x}$ = $\frac{3}{x?3}$
? 3(1 - x) = x - 3
3 - 3x = x - 3
Rearrange 6 = 4x; x = $\frac{6}{4}$
= $\frac{3}{2}$

Given that for sets A and B, in a universal set E, A $?$ B then A $?$(A $?$ B)1 is

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A $\subset$ B means A is contained in B i.e. A is a subset of B(A $\cap$ B)1 = A1
A(A $\cap$ B)1 = A $\cap$ A1
The intersection of complement of a set P and P1 has no element
i.e. n(A $\cap$ A1) = $\varphi$

If the 6th term of an arithmetic progression is 11 and the first term is 1, find the common difference.

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To find the common difference of the arithmetic progression, we can use the formula: nth term = a + (n - 1)d where a is the first term, d is the common difference, and n is the term number. In this case, we know that the first term is 1, and the sixth term is 11. So we can plug these values into the formula: 11 = 1 + (6 - 1)d Simplifying the right-hand side, we get: 11 = 1 + 5d Subtracting 1 from both sides, we get: 10 = 5d Dividing both sides by 5, we get: d = 2 Therefore, the common difference of the arithmetic progression is 2.

$\begin{array}{ccccc}\oplus mod10& 2& 4& 6& 8\\ 2& 4& 8& 2& 6\\ 4& 8& 6& 4& 2\\ 4& 8& 6& 4& 2\\ 6& 2& 4& 6& 8\\ 8& 6& 2& 8& 4\end{array}$

The multiplication table above has modulo 10 on the set S = (2, 4, 6, 8). Find the inverse of 2

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The inverse of 2 is 6 since 2 x 6 = 12; under mod 10
12 = 2 which is also the value required

A binary operation $\oplus$ is defines on the set of all positive integers by a $\oplus$ b = ab for all positive integers a, b. Which of the following properties does NOT hold?

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a $\oplus$ b = ab
The set of all national rules Q, is closed under the operations, additions, subtraction, multiplication and division. Since a $\oplus$ b = ab; b $\oplus$ a = ba = ab
The number 1 is the identity element under multiplication

In the diagram, PTS is a tangent to the circle TQR at T. Calculate < RTS

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RTS = RQT (angle between a tangent and a chord at the point of contact is equal to the angle in the alternate segment) But R = Q + T = 180

RQT = 180${}^{?}$ - (50 + 60)

= 180${}^{?}$ - 110${}^{?}$

= 70${}^{?}$

Since RQT = RTS = 70${}^{?}$

The mean of twelve positive numbers is 3. When another number is added, the mean becomes 5. Find the thirteenth number

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Let the sum of the 12 numbers be x and the 13th number be y.

x12=3⟹x=36 $\frac{x}{12}=3⟹x=36$

36+y13=5⟹36+y=65 $\frac{36+y}{13}=5⟹36+y=65$

y=65−36=29

Find the value of log10 r + log10 r2 + log10 r4 + log10 r8 + log10 r16 + log10 r32 = 63

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log10 r + log10 r2 + log10 r4 + log10 r8 + log10 r16 + log10 r32 = 63
log10r63 = 63
63 = 1063
∴ r = 10

The angle of depression of a boat from the top of a cliff 10m high is 30. How far is the boat from the foot of the cliff?

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The given scenario can be visualized as follows:

          A (top of cliff)
          /|
         / |
        /  |
       /   | 10m
      /    |
     /θ    |   
    /      |
   /       |
  B--------C (boat on water surface)

Here, the angle of depression of point B from point A is given as 30 degrees. We are required to find the distance between point B and point C, denoted by BC.

We know that the tangent of an angle is the ratio of the opposite side to the adjacent side. In this case, the opposite side is AB and the adjacent side is BC.

Thus, we have:

tan 30° = AB / BC

AB is the height of the cliff, which is given as 10m.

Hence, we have:

1/√3 = 10 / BC

Solving for BC, we get:

BC = 10√3 meters

Therefore, the boat is 10√3 meters away from the foot of the cliff.

Hence, the answer is 10√3m.

Solve for r in the following equation $\frac{1}{r-1}$ + $\frac{2}{r+1}$ = $\frac{3}{r}$

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$\frac{1}{r-1}$ + $\frac{2}{r+1}$ = $\frac{3}{r}$
Multiply through by r(r -1) which is the LCM
= (r)(r + 1) + 2(r)(r - 1)
= 3(r - 1)(r + 1)
= r2 + r + 2r2 - 2r
3r2 - 3 = 3r2
r = 3r2 - 3
-r = -3
∴ r = 3

Factorize a2x - b2y - b2x + a2y

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We can use the identity a^2 - b^2 = (a+b)(a-b) to factorize the expression. Let's rewrite the expression using this identity: a^2x - b^2y - b^2x + a^2y = (a^2x + a^2y) - (b^2x + b^2y) Now we can see that we have a common factor of (a^2 - b^2) in both terms. (a^2 - b^2)(x + y) = (a + b)(a - b)(x + y) So the correct answer is: (a + b)(a - b)(x + y)

If three angles of a quadrilateral are (3y - x - z)o, 3xo, (2z - 2y - x)o find the fourth angle in terms of x, y and z

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The sum of angles of a quadrilateral is 360o
∴ (3y - x - z)o + 3xo + (2z - 2y - x)o + po = 360o
Where P is the fourth angle
3y - x - z + 3x + 2z - 2y - x + p = 360o
p = 360 - (x + y + z)
∴ p = (360 - x - y - z)o

$\begin{array}{cccccc}x& 1& 2& 3& 4& 5\\ f& y+2& y-2& 2y-3& y+4& 3y-4\end{array}$

This table shows the frequency distribution of a data if the mean is $\frac{43}{14}$ find y

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If M(4, q) is the mid-point of the line joining L(p, -2) and N(q, p). Find the values of p and q

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To find the values of p and q, we can use the midpoint formula, which states that the midpoint of a line segment between two points (x1, y1) and (x2, y2) is ((x1+x2)/2, (y1+y2)/2). Here, we are given that M(4,q) is the midpoint of the line joining L(p,-2) and N(q,p). So we know that: - The x-coordinate of M is the average of the x-coordinates of L and N: (p+q)/2 = 4 - The y-coordinate of M is the average of the y-coordinates of L and N: (-2+p)/2 = q Simplifying the first equation, we get: (p+q)/2 = 4 p+q = 8 q = 8-p Substituting this into the second equation, we get: (-2+p)/2 = q (-2+p)/2 = 8-p -2+p = 16-2p 3p = 18 p = 6 Therefore, the values of p and q are: - p = 6 - q = 8-p = 2 So the correct option is p = 6, q = 2.

Solve for x if 25x + 3(5x) = 4

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Find the range of values of x for which 1x $\frac{1}{x}$ > 2 is true

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1x $\frac{1}{x}$ > 2 = xx2 $\frac{x}{x^2}$ > 2

x > 2x2

= 2x2 < x

= 2x2 - x < 0

= x(2x - 10 < 0

Case 1(+, -) = x > 0, 2x - 1 < 0

x > 0, x < 12 $\frac{1}{2}$ (solution)

Case 2(-, 4) = x < 0, 2x - 1 > 0

x < 0, x , 12 $\frac{1}{2}$ = 0

In the frustum of the cone, the top diagram is twice the bottom diameter. If the height of the frustum is h centimeters, find he height of the cone.

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$\frac{x}{r}$ = $\frac{x+h}{2r}$

2 x r = r (x + h)

Total height of cone = x + h

but x = h

total height = 2h

The equation of the graph is

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y = x3 - 27, y = -27 $\to$ (0, -27)

when y = 0, x = 3 (3, 0)

$\begin{array}{cccccc}x& 1& 2& 3& 4& 5\\ f& 2& 1& 2& 1& 2\end{array}$

Find the variance of the frequency distribution above

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$\begin{array}{cccccc}x& f& fx& \overline{x}?x& (\overline{x}?x{)}^2& f(\overline{x}?x{)}^2\\ 1& 2& 2& ?2& 4& 8\\ 2& 1& 2& ?1& 1& 1\\ 3& 2& 6& 0& 0& 0\\ 4& 1& 4& 1& 1& 1\\ 2& 2& 10& 2& 4& 8\\ & 8& 24& & & 18\end{array}$
x = $\frac{?fx}{?f}$
= $\frac{24}{8}$
= 3
Variance (62) = $\frac{?f(\overline{x}?x{)}^2}{?f}$
= $\frac{18}{8}$
= $\frac{9}{4}$

he determination of the matrix $\left(\begin{array}{ccc}1& 3& 3\\ 4& 5& 6\\ 2& 0& 1\end{array}\right)$ is

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4 x 2 = -8 upward arrows = +ve
2 x 5 x 3 = 30
0 x 6 = $\frac{0}{22}$ downward arrows = -ve
-1(1 x 5x - 1) = 5 - (2 x 6 x 2) = -24
= -(4 x 0 x 1)
= $\frac{0}{-19}$
therefore 22 - 19 = 3

Calculate the perimeter, in cm, of a sector of a circle of radius 8cm and angle 45o

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Perimeter = OP + OQ + PQ
= 8 + 8 + PQ
length PQ = $\frac{\theta }{360\times 2\pi r}$
= $\frac{45}{360}$ x 2 x $\pi$ x 8
= 2$\pi$
Perimeter of sector 2r + L
Where l = length of arc and r = radius
∴ P = 2(8) + 2$\pi$
= 16 + 2$\pi$

In the diagram. Find h

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A$△$ = $\sqrt{S(S-a)(S-b)(S-c)}$ (Hero's Formula)

S = $\frac{a+b+c}{2}$ = $\frac{5+6+7}{2}$

$\frac{18}{2}=9$

A$△$ $\sqrt{9}\times 4\times 3\times 2$

$\sqrt{216}=6\sqrt{6}c{m}^3$

A$△$ = $\frac{1}{2}\times 6\times h$

6$\sqrt{6}=\frac{1}{2}\times 7\times h$

h = $\frac{12}{h}\sqrt{6}$

In a survey, it was observed that 20 students read newspapers and 35 read novels. If 40 of the students read either newspapers or novels, what is the probability of the students who read both newspapers and novels?

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40 = 20 - x + x + 35 - x
40 = 55 - x
x = 55 - 40
= 15
∴ P(both) $\frac{15}{40}$
= $\frac{3}{8}$

Find the point (x, y) on the Euclidean plane where the curve y = 2x2 - 2x + 3 has 2 as gradient

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We know that the gradient of a curve is given by its derivative. Therefore, we need to find the derivative of the given curve and equate it to 2 to find the point where the gradient is 2. y = 2x^2 - 2x + 3 dy/dx = 4x - 2 Equating dy/dx to 2, we get: 4x - 2 = 2 4x = 4 x = 1 Substituting x = 1 in the original equation, we get: y = 2(1)^2 - 2(1) + 3 y = 3 Therefore, the point where the curve has a gradient of 2 is (1, 3). So, the correct option is: (1, 3).

$\begin{array}{cccccc}\text{Class Interval}& 1-5& 6-10& 11-15& 16-20& 21-25\\ Frequency& 6& 15& 20& 7& 2\end{array}$

Estimate the median of the frequency distribution above

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Median = L + [$\frac{\frac{N}{2}-f}{fm}$]h
N = Sum of frequencies
L = lower class boundary of median class
f = sum of all frequencies below L
fm = frequency of modal class and
h = class width of median class
Median = 11 + [$\frac{\frac{50}{2}-21}{20}$]5
= 11 + ($\frac{25-21}{20}$)5
= 11 + ($\frac{\left(4\right)}{20}$)
11 + 1 = 12

Without using table, solve the equation 8x-2 = $\frac{2}{25}$

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8x-2 = $\frac{2}{25}$
= 200x-2 = 2
= 100x-2 = 1
x-2 = $\frac{1}{100}$
x-2 = 10-2
x = 10

Simplify $\sqrt{48}$ - $\frac{9}{\sqrt{3}}$ + $\sqrt{75}$

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$\sqrt{48}$ - $\frac{9}{\sqrt{3}}$ + $\sqrt{75}$
Rearrange = $\sqrt{48}$ + $\sqrt{75}$ - $\frac{9}{\sqrt{3}}$
= (√16 x √3) + (√25 x √3) - $\frac{9}{\sqrt{3}}$
=4√3 + 5√3 - $\frac{9}{\sqrt{3}}$
Rationalize $\to$ 9√3 = $\frac{9}{\sqrt{3}}$ x $\frac{\sqrt{3}}{\sqrt{3}}$
= $\frac{9\sqrt{3}}{\sqrt{9}}$ - $\frac{9\sqrt{3}}{\sqrt{3}}$
= 3√3

Given that √2 = 1.1414, find without using tables, the value of $\frac{1}{\sqrt{2}}$

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$\frac{1}{\sqrt{2}}$ = $\frac{1}{\sqrt{2}}$ x $\frac{\sqrt{2}}{\sqrt{2}}$
= $\frac{\sqrt{2}}{2}$
= $\frac{1.414}{2}$
= 0.707

Find the mean deviation of the set of numbers 4, 5, 9

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To find the mean deviation of a set of numbers, we first need to find the mean or average of those numbers. The mean of the numbers 4, 5, and 9 is: (mean) = (4 + 5 + 9) / 3 = 6 Next, we need to find the deviation of each number from the mean. To do this, we subtract the mean from each number: 4 - 6 = -2 5 - 6 = -1 9 - 6 = 3 To avoid positive and negative deviations cancelling out, we take the absolute value of each deviation: | -2 | = 2 | -1 | = 1 | 3 | = 3 Then, we find the mean of these absolute deviations by summing them up and dividing by the number of numbers: (2 + 1 + 3) / 3 = 2 Therefore, the mean deviation of the set of numbers 4, 5, 9 is 2. So, the correct option is 2.

Simplify $\frac{(2m?u{)}^2?(m?2u{)}^2}{5m^2?5u^2}$

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$\frac{(2m?u{)}^2?(m?2u{)}^2}{5m^2?5u^2}$
= $\frac{2m?u+m?2u\left)\right(2m?u?m+2u)}{5(m+u)(m?u)}$
= $\frac{3(m?u)(m+u)}{5(m+u)(m?u)}$
= $\frac{3}{5}$

An open rectangular box is made of wood 2cm thick. If the internal dimensions of the box are 50cm long, 36cm wide and 20cm deep, the box volume of wood in the box is

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Internal dimension are 50cm, 36cm and 20cm
internal volume = 50 x 36 x 20cm3
1000 x 36cm3
= 36000cm3
External dimension are 54cm x 40cm x 22cm
= 2160cm2 x 22cm = 47520cm3
Volume of wood = Ext. volume - Int. volume
= 47,520cm3 - 36,000cm3
= 11,520cm3

$\begin{array}{cccc}\text{Age in years}& 10& 11& 12\\ \text{Number of pupils}& 6& 27& 7\end{array}$

The table above shows the number of pupils in each age group in a class. What is the probability that a pupil chosen at random is at least 11 years old?

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To find the probability that a pupil chosen at random is at least 11 years old, we need to add up the number of pupils in the 11-year-old and 12-year-old age groups, since they are the ones who are at least 11 years old. From the table, we can see that there are 27 pupils who are 11 years old and 7 pupils who are 12 years old. Therefore, the total number of pupils who are at least 11 years old is 27 + 7 = 34. To find the probability, we divide the number of pupils who are at least 11 years old by the total number of pupils in the class. From the table, we can see that the total number of pupils in the class is 6 + 27 + 7 = 40. Therefore, the probability that a pupil chosen at random is at least 11 years old is: 34/40 = 17/20 So the answer is: 17/20.

Find P if $\frac{x?3}{(1?x)(x+2)}$ = $\frac{p}{1?x}$ + $\frac{Q}{x+2}$

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$\frac{x-3}{(1-x)(x+2)}$ = $\frac{p}{1-x}$ + $\frac{Q}{x+2}$
Multiply both sides by LCM i.e. (1 - x(x + 2))
∴ x - 3 = p(x + 2) + Q(1 - x)
When x = +1
(+1) - 3 = p(+1 + 2) + Q(1 - 1)
-2 = 3p + 0(Q)
3p = -2
∴ p = $\frac{-2}{3}$

The equation of the line in the graph is

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Gradient of line = $\frac{\text{Change in y}}{\text{Change in x}}=\frac{y_2-y_1}{x_2-x_1}$

y2 = 0, y1 = 4

x2 = 3 and x1 = 0

$\frac{y_2-y_1}{x_2-x_1}=\frac{0-4}{3-0}=\frac{-4}{3}$

Equation of straight line = y = mx + c

where m = gradient and c = y

intercept = 4

y = 4x + $\frac{4}{3}$, multiple through by 3

3y = 4x + 12

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SQR + RQV + VQU = 18o angle on a straight line SP is parallel to QR and PV is parallel to TR

< STP = < RQV = 30o

But SQR + 30o + 50o = 180o

SQR = 180 - 80

= 100o

What is the value of sin(-690)?

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The sine function is a periodic function, which means that its values repeat after a certain interval. Specifically, the sine function has a period of 360 degrees (or 2π radians), which means that sin(x) = sin(x ± 360) for any angle x. In this case, we want to find the value of sin(-690). To do so, we can add or subtract multiples of 360 degrees to get an angle in the range between -360 and 360 degrees. Adding 2*360 degrees to -690 gives us an equivalent angle of 30 degrees, since -690 + 2*360 = -690 + 720 = 30. Now we can use the unit circle or a calculator to find the sine of 30 degrees. The exact value of sin(30) is 1/2, which means that sin(-690) is also equal to 1/2. Therefore, the answer is: - 1/2 Note that none of the given options match this answer exactly, so it's possible that there is a mistake in the question or answer choices.

The grades A1, A2, A3, C4 and F earned by students in a particular course are shown in the pie chart. What percentage of the students obtained a C4 grade?

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Evaluate $\frac{0.36\times 5.4\times 0.63}{4.2\times 9.0\times 2.4}$

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$\frac{0.36\times 5.4\times 0.63}{4.2\times 9.0\times 2.4}$
= $\frac{36}{420}\times \frac{54}{90}\times \frac{63}{240}$
= $\frac{6}{70}\times \frac{18}{30}\times \frac{21}{80}$
= $\frac{27}{2000}$
= 0.0135
$\approx$ = 0.013

What is the locus of a point P which moves on one side of a straight line XY, so that the angle XPY is always equal to 90o?

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Since XY is a fixed line and
XPY = 90o P is on one side of XY
P1P2P3......Pn are all possible cases where
XPY = 90o the only possible tendency is a semicircle because angles in semicircle equals 90o

If y = 3t3 + 2t2 - 7t + 3, find $\frac{dy}{dt}$ at t = -1

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y = 3t3 + 2t2 - 7t + 3
$\frac{dy}{dt}$ = 9t2 + 4t - 7
When t = -1
$\frac{dy}{dt}$ = 9(-1)2 + 4(-1) - 7
= 9 - 4 -7
= 9 - 11
= -2

Find the inequality which represents the shaded portion in the diagram

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The shaded area in the diagram represents the region below the line passing through the points (1, 0) and (0, 2). To find the equation of the line, we first need to find its slope: slope = (change in y) / (change in x) slope = (0 - 2) / (1 - 0) slope = -2 Next, we use the point-slope form of the equation of a line to find the equation of the line: y - 0 = -2(x - 1) y = -2x + 2 Now we can test each inequality option to see which one represents the shaded region. We can do this by picking a point in the shaded region, plugging in its coordinates into the inequality, and checking if the inequality is true. For example, the point (0, 0) is in the shaded region, so we plug in x=0 and y=0 into each inequality: - 2(0) - 0 - 2 ≥ 0 is false - 2(0) - 0 - 2 ≤ 0 is true - 2(0) - 0 - 2 < 0 is true - 2(0) - 0 - 2 > 0 is false Therefore, the inequality that represents the shaded portion in the diagram is 2x - y - 2 ≤ 0.

Evaluate $\frac{1}{3}÷\left[\frac{5}{7}\right(\frac{9}{10}?1+\frac{3}{4}\left)\right]$

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$\frac{1}{3}÷\left[\frac{5}{7}\right(\frac{9}{10}?1+\frac{3}{4}\left)\right]$
$\frac{1}{3}÷\left[\frac{5}{7}\right(\frac{9}{10}?\frac{10}{10}+\frac{3}{4}\left)\right]$
= $\frac{1}{3}÷\left[\frac{5}{7}\right(\frac{?1}{10}+\frac{3}{4}\left)\right]$
= $\frac{1}{3}÷\left[\frac{5}{7}\right(\frac{?2+15}{20}\left)\right]$
= $\frac{1}{3}÷[\frac{5}{7}\times \frac{13}{20}]$
$\frac{1}{3}+\left[\frac{13}{28}\right]$ = $\frac{1}{3}\times \frac{28}{13}$
= $\frac{28}{39}$

Evaluate ${\int }_{-1}^1$(2x + 1)2dx

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${\int }_{-1}^1$(2x + 1)2dx
= ${\int }_{-1}^1$(4x2 + 4x + 1)dx
= ${\int }_{-1}^1$[$\frac{4x^3}{3}$ + 2x2 + c]
= [$\frac{4}{3}$ + 3 + c] - [4 + $\frac{1}{3}$ + c]
= $\frac{8}{3}$ + 3 + -1 - C
= $\frac{8}{3}$ + 2
= $\frac{14}{3}$
= $\frac{42}{3}$

In the diagram, O is the centre of the circle. If SOQ is a diameter and < PRS is 38${}^{\circ }$, what is the value of < PSQ

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Since SOQ is a diameter of the circle, angle SPQ = 90 degrees (angles subtended by a diameter are always 90 degrees). Therefore, angle PSQ is the difference between angle PRS and angle SPQ. Angle PSQ = angle PRS - angle SPQ = 38 - 90 = -52 degrees. However, since angles in a circle add up to 360 degrees, we can add 360 degrees to -52 to get the equivalent angle in the circle. Angle PSQ = -52 + 360 = 308 degrees. Therefore, the value of angle PSQ is 308 degrees. So the correct option is: 52∘.

Find the nth term of the sequence 3, 6, 10, 15, 21.....

Awọn alaye Idahun

$\frac{(n+1)(n+2)}{2}$
If n = 1, the expression becomes 3
n = 2, the expression becomes 6
n = 4, the expression becomes 15
n = 5, the expression becomes 21