QUANTITATIVE APTITUDE: NUMBER SERIES QUIZ FOR IBPS PO, RRB, CLERK AND OTHER EXAM PART-1

Direction (Q.1-5): What should come at the place of question mark (?) in the following number series?
Q.1 7, 15, 47, 191, ?, 5759
A. 910
B. 845
C. 950
D. 959
E. 820


Q.2 21, 25, 16, ?, 7, 43
A. 25
B. 32
C. 30
D. 21
E. None of these

Q.3 2732, ?, 172, 44, 12, 4
A. 420
B. 625
C. 684
D. 511
E. 721

Q.4 12, 7, 9, 22, ?, 784
A. 96
B. 72
C. 82
D. 63
E. None of these.

Q.5 36, 72, 42, 63, 54, ?, 78, 9
A. 61
B. 54
C. 81
D. 36
E. 45

Answers:

Ans.1 D.
Ans.2 B.
Ans.3 C.
Ans.4 A.
Ans.5 E.

Explanation:

Ans.1
7×2+1 = 15
15×3+2 = 47
47×4+3 = 191
191×5+4 = 959
959×6+5 = 5759
Ans.2
21+(2×2) = 25
25-(3×3) = 16
16+(4×4) = 32
32-(5×5) = 7
7+(6×6) = 43

Ans.3
2732÷4+1 = 684
684÷4+1 = 172
172÷4+1 = 44
44÷4+1 = 12
12÷4+1 = 4

Ans.4
12×.5+1 = 7
7×1+2 = 9
9×2+4 = 22
22×4+8 = 96
96×8+12 = 784

Ans.5
There are 2 series in this question:

36+6 = 42
42+12 = 54
54+24 = 78

72-9 = 63
63-18 = 45
45-36 = 9