100+ IBPS PO Quantitative Aptitude Questions with Answers - 2
Question: 6
Insert the missing number:
7, 26, 63, 124, 215, 342, (…..)
(A) 391
(B) 421
(C) 481
(D) 511
Ans: D
Numbers are (23 - 1), (33 - 1), (43 - 1), (53 - 1), (63 - 1), (73 - 1) etc.
Question: 7
Insert the missing number:
1, 8, 27, 64, 125, 216, (…..)
(A) 245
(B) 343
(C) 354
(D) 392
Ans: B
Numbers are 13, 23, 33, 43, 5 3, 63. So, the missing number is 73 = 343.
Question: 8
Insert the missing number:
8, 24, 12, 36, 18, 54, (…..)
(A) 27
(B) 72
(C) 68
(D) 108
Ans: A
Numbers are alternately multiplied by 3 and divided by 2.
So, the next number = $${54} / {2}$$ = 27.
Question: 9
Insert the missing number:
11, 13, 17, 19, 23, 29, 31, 37, 41, (…..)
(A) 43
(B) 47
(C) 51
(D) 53
Ans: A
Numbers are all primes. The next prime is 43.
Question: 10
Insert the missing number:
10, 5, 13, 10, 16, 20, 19, (…..)
(A) 22
(B) 23
(C) 38
(D) 40
Ans: D
There are two series (10, 13, 16, 19) and (5, 10, 20, 40), one increasing by 3 and the other multiplied by 2.
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