Top 1000+ Quantitative Aptitude Questions with Answers - 1

Question: 1

Find out the wrong number in the series:
2880, 480, 92, 24, 8, 4, 4

(A) 4

(B) 8

(C) 24

(D) 92

Ans: D

Go on dividing by 6, 5, 4, 3, 2, 1 respectively to obtain the next number.

Clearly, 92 is wrong.

Question: 2

Find out the wrong number in the series:
3, 4, 9, 22.5, 67.5, 202.5, 810

(A) 4

(B) 9

(C) 67.5

(D) 202.5

Ans: A

There are two sequences (3, 9, 67.5, 810) and (4, 22.5, 202.5).

Pattern is : (1st term x 3), (2nd term x 7.5), (3rd term x 12) for the first sequence and (1st term x 5), (2nd term x 9) and so on for the second sequence.

Question: 3

Complete the following series.
9, 11, 15, 23, 39, ?

(A) 42

(B) 56

(C) 64

(D) 71

Ans: D

9 + 2 = 11

11 + 4 = 15

15 + 8 = 23

23 + 16 = 39

39 + 32 = 71.

Question: 4

Find out the wrong number in the series:
4, 9, 16, 25, 32, 49

(A) 16

(B) 25

(C) 32

(D) 49

Ans: C

Except 32, all numbers in the sequence are perfect squares.

Therefore, 32 is wrong.

Question: 5

Find out the wrong number in the series:
10, 25, 56, 70, 85, 95, 125

(A) 10

(B) 56

(C) 85

(D) 125

Ans: B

Except 56, all numbers are multiplies of 5.

Therefore, 56 is wrong.

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