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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