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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