100+ IBPS PO Quantitative Aptitude Questions with Answers - 1

Question: 1

Insert the missing number:
4, - 8, 16, - 32, 64, (…..)

(A) -128

(B) 128

(C) 192

(D) -192

Ans: A

Each number is the preceding number multiplied by -2.

So, the required number is -128.

Question: 2

Insert the missing number:
15, 31, 63, 127, 255, (…..)

(A) 511

(B) 513

(C) 517

(D) 523

Ans: A

Each number is double the preceding one plus 1.

So, the next number is (255 x 2) + 1 = 511.

Question: 3

Insert the missing number:
71, 76, 69, 74, 67, 72, (…..)

(A) 65

(B) 76

(C) 77

(D) 80

Ans: A

Alternately, we add 5 and subtract 7.

Question: 4

Insert the missing number:
1, 4, 9, 16, 25, 36, 49, (…..)

(A) 54

(B) 56

(C) 64

(D) 81

Ans: C

Numbers are 12, 22, 32, 42, 52, 62, 72. So, the next number is 82 = 64.

Question: 5

Insert the missing number:
165, 195, 255, 285, 345, (…..)

(A) 375

(B) 390

(C) 420

(D) 435

Ans: D

Each number is 15 multiplied by a prime number. i.e. 15 x 11, 15 x 13, 15 x 17, 15 x 19, 15 x 23.

So, the next number is 15 x 29 = 435.

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