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JAMB Mathematics 2017 Objective Past Questions

All 40 questions from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2017 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.

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Mathematics 2017 Objective — Question 3

A binary operation on the set of real numbers is defined by x * y = (x+y)/z for all x,y ∈ R. Find 7*5.

  • A. A. 8
  • B. B. 9
  • C. C. 5
  • D. D. 6Correct

Explanation

x*y=(x+y)/2 = (7+5)/2 = 6.

Mathematics 2017 Objective — Question 4

If the midpoint of (2,x) and (y,2) has respective values of x and y as

Diagram for question 4
  • A. A. 2, 6Correct
  • B. B. 3, 6
  • C. C. 4, 3
  • D. D. 6, 4

Explanation

Midpoint formula: (2+y)/2=4, (x+2)/2=2. Solving gives y=6, x=2.

Mathematics 2017 Objective — Question 5

The histogram shows the number of participants in a meeting from Monday to Friday. How many participated on Monday, Wednesday and Thursday?

  • A. A. 55
  • B. B. 50Correct
  • C. C. 65
  • D. D. 45

Explanation

Reading the histogram bars for Monday, Wednesday and Thursday and summing them gives 50.

Mathematics 2017 Objective — Question 9

From the diagram, MNRS is a cyclic quadrilateral with angle 100° marked; find the value of x.

  • A. A. 90°
  • B. B. 110°
  • C. C. 100°
  • D. D. 80°Correct

Explanation

Opposite angles of a cyclic quadrilateral are supplementary; x = 180° - 100° = 80°.

Mathematics 2017 Objective — Question 10

Given: M={1,2,3,4,5}, N={1,2,4,5,3}, Z={2,1,4,5}. Which of the following is accurate?

  • A. A. N ⊆ MCorrect
  • B. B. N ⊂ M
  • C. C. Z ⊆ M
  • D. D. N ⊂ Z

Explanation

M and N contain exactly the same elements, so N ⊆ M (N is a subset of, and equal to, M).

Mathematics 2017 Objective — Question 11

Find the number of sides of a regular polygon if the size of each interior angle is 150°.

  • A. A. 9
  • B. B. 12Correct
  • C. C. 10
  • D. D. 14

Explanation

Exterior angle = 180-150 = 30°; number of sides = 360/30 = 12.

Mathematics 2017 Objective — Question 12

Given that θ is an acute angle and tanθ = 12/5, find sinθ.

  • A. A. 12/13Correct
  • B. B. 5/12
  • C. C. 5/13
  • D. D. 5/13

Explanation

With opposite=12, adjacent=5, hypotenuse=13 (Pythagoras), sinθ = opposite/hypotenuse = 12/13.

Mathematics 2017 Objective — Question 13

Find the sum to infinity of the series 1/4, 1/12, 1/36, ...

  • A. A. 7/24
  • B. B. 3/8Correct
  • C. C. 1/8
  • D. D. 1/3

Explanation

a=1/4, r=1/3; Sum to infinity = a/(1-r) = (1/4)/(2/3) = 3/8.

Mathematics 2017 Objective — Question 14

The operation below was carried out in base 2. Find the missing number: 1011 + 1111 = 11010; missing number = ?

  • A. A. 1001
  • B. B. 1000Correct
  • C. C. 1010
  • D. D. 1001

Explanation

Given a+b+c=d and a,b,c known, the missing addend/number found by binary subtraction is 1000.

Mathematics 2017 Objective — Question 15

A box containing 10 black, 4 green and 6 yellow pens. What is the probability of picking a yellow pen with eyes closed?

  • A. A. 1/6
  • B. B. 7/10
  • C. C. 3/10Correct
  • D. D. 1/2

Explanation

P(yellow) = number of yellow pens / total pens = 6/20 = 3/10.

Mathematics 2017 Objective — Question 17

If x-3 divides x³-2x²-x+6, find the remainder.

  • A. A. 27
  • B. B. 9
  • C. C. 12Correct
  • D. D. 18

Explanation

By the remainder theorem, remainder = f(3) = 3³-2(3)²-3+6 = 27-18-3+6 = 12.

Mathematics 2017 Objective — Question 18

The locus of a point moving with equal distance from a fixed point is

  • A. A. a parabola
  • B. B. a sphere
  • C. C. a circleCorrect
  • D. D. an ellipse

Explanation

A set of points equidistant from a fixed point (in a plane) traces a circle.

Mathematics 2017 Objective — Question 19

Solve x² - 5x + 6 ≤ 0.

  • A. A. -3 ≤ x ≤ 2
  • B. B. -2 ≤ x ≤ -1
  • C. C. 1 ≤ x ≤ 2
  • D. D. 2 ≤ x ≤ 3Correct

Explanation

Factorising: (x-2)(x-3) ≤ 0, giving 2 ≤ x ≤ 3.

Mathematics 2017 Objective — Question 20

Find the area of a parallelogram PQRS with base 16cm long and height 8cm.

  • A. A. 126cm²
  • B. B. 128cm²Correct
  • C. C. 122cm²
  • D. D. 124cm²

Explanation

Area of a parallelogram = base x height = 16 x 8 = 128cm².

Mathematics 2017 Objective — Question 21

If U={1,2,3...10} and N={2,4,6,8,10}, find N'.

  • A. A. {1,2,3,5,9}
  • B. B. {1,3,6,7,9}
  • C. C. {1,3,5,7,9}Correct
  • D. D. {1,3,5,7}

Explanation

N' (complement of N in U) contains elements in U not in N: {1,3,5,7,9}.

Mathematics 2017 Objective — Question 22

21, 21, 21, 22, 22, 22, 22, 23, 23, 24, 24, 24, 24, 24, 25, 26, 36, 36, 36. Find the mode of the distribution.

  • A. A. 24Correct
  • B. B. 26
  • C. C. 36
  • D. D. 25

Explanation

24 occurs most frequently (5 times), so it is the mode.

Mathematics 2017 Objective — Question 24

21,21,21,22,22,22,22,23,23,24,24,24,24,24,25,26,36,36,36. Find the mean of the distribution.

  • A. A. 20
  • B. B. 23
  • C. C. 25Correct
  • D. D. 30

Explanation

Sum of all 19 values = 476. Mean = 476/19 ≈ 25.

Mathematics 2017 Objective — Question 25

From the top of a tree, the angle of depression to a point on the ground 5m away is 60°. Find the height of the tree.

  • A. A. 5√3 mCorrect
  • B. B. √55 m
  • C. C. 4√5 m
  • D. D. √60 m

Explanation

tan60° = height/5, so height = 5tan60° = 5√3 m.

Mathematics 2017 Objective — Question 26

Factorize completely: 4u² - 36uv - uv + 9v².

  • A. A. (4u+v)(u+9v)
  • B. B. (4u+v)(u-9v)
  • C. C. (4u-v)(u-9v)Correct
  • D. D. (4u-v)(u+9v)

Explanation

Grouping: 4u²-36uv-uv+9v² = 4u(u-9v)-v(u-9v) = (4u-v)(u-9v).

Mathematics 2017 Objective — Question 27

Find the turning points of the function y = x³ - x² - x.

  • A. A. 1, -1/3
  • B. B. -1, 1/-3
  • C. C. -1, 1/3
  • D. D. 1, 1/3Correct

Explanation

dy/dx = 3x²-2x-1 = 0 gives x = 1 or x = -1/3; substituting gives the turning points.

Mathematics 2017 Objective — Question 28

If Q=[3 -1 1; -2 1 -1; 1 -3 2], find -3Q.

  • A. A. [-9 3 -3; 6 -3 3; -3 9 -6]Correct
  • B. B. [9 -6 3; -6 3 3; 3 -9 -6]
  • C. C. [-9 6 3; 3 -9 -6; 9 -6 3]
  • D. D. [-6 3 -3; -3 9 -6]

Explanation

Multiply every entry of Q by -3.

Mathematics 2017 Objective — Question 29

Find the number of ways the letters of the word COMMITTEE can be permuted.

  • A. A. 9!
  • B. B. 9!/(2!2!2!)Correct
  • C. C. 9!/2!2!
  • D. D. 9!/2!

Explanation

COMMITTEE has 9 letters with M, T, E each repeated twice: 9!/(2!2!2!).

Mathematics 2017 Objective — Question 30

If P varies inversely as the square of q and p=4 when q=5, find p when q=2.

  • A. A. 32
  • B. B. 12
  • C. C. 16
  • D. D. 25Correct

Explanation

p=k/q²; k=pq²=4x25=100. When q=2, p=100/4=25.

Mathematics 2017 Objective — Question 33

A car was put on sale for N12,000. It was sold for a discount of 20%. How much was paid for it?

  • A. A. N7,200
  • B. B. N9,600Correct
  • C. C. N49,800
  • D. D. N6,400

Explanation

Discount = 20% of 12,000 = 2,400. Amount paid = 12,000 - 2,400 = N9,600.

Mathematics 2017 Objective — Question 36

Evaluate (5⁻³ x 5⁻⁴)/(5⁻⁶ x 5⁻²).

Diagram for question 36
  • A. A. 5Correct
  • B. B. 25
  • C. C. -7
  • D. D. 48

Explanation

Numerator: 5^(-3-4)=5⁻⁷. Denominator: 5^(-6-2)=5⁻⁸. Dividing: 5^(-7-(-8))=5¹=5.

Mathematics 2017 Objective — Question 37

From the diagram, a triangle is inscribed with a circle; find the value of x.

  • A. A. 15°Correct
  • B. B. 45°
  • C. C. 25°
  • D. D. 30°

Explanation

The exterior angle of the triangle equals the sum of the two opposite interior angles: 65° = x° + 50°, so x = 15°.

Mathematics 2017 Objective — Question 38

The bar chart is a representation of a candidate's scores in UTME 2014 (Physics 75, Maths 45, Chem 60, Eng 30). Find his total score.

  • A. A. 210Correct
  • B. B. 240
  • C. C. 340
  • D. D. 200

Explanation

Total = 75+45+60+30 = 210.

Mathematics 2017 Objective — Question 39

A boy moves from a point P to another point Q due north. He then moves an equal distance to another point R due east. What is the bearing of R from P?

  • A. A. 300°
  • B. B. 135°
  • C. C. 225°
  • D. D. 045°Correct

Explanation

Moving equal distances north then east from P forms a right-angled isosceles triangle; the bearing of R from P is N45°E = 045°.

Mathematics 2017 Objective — Question 40

Find the common difference of an A.P. whose 4th term is 24 and 11th term is 52.

  • A. A. 4Correct
  • B. B. 3
  • C. C. 14
  • D. D. 12

Explanation

T4=a+3d=24, T11=a+10d=52. Subtracting: 7d=28, so d=4.

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