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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