Number Series Asked in IBPS PO - VI (Prelim) Exam - 22.10.2016 (3rd Shift)

Directions (1-5): What should come in place of the question mark (?) in the following number series?

1. 12         6.5          7.5          17          72          ?
a) 356
b) 82
c) 185
d) 292
e) 365
2. 463          220          139          112          ?          100
a) 101
b) 100
c) 104
d) 103
e) 102

3. 17          30          21          34          25          ?
a) 28
b) 30
c) 27
d) 36
e) 40

4. 31          33          40          68          131          ?
a) 232
b) 257
c) 132
d) 250
e) 275

5. 11          16          34          66          113          ?
a) 130
b) 160
c) 176
d) 175
e) 177

Answers:

1. e) 365

Solution:
12 x 0.5 + 0.5 = 6.5
6.5 x 1 + 1 = 7.5
7.5 x 2 + 2 = 17
17 x 4 + 4 = 72
72 x 5 + 5 = 365

2. d) 103

Solution:
463 – 220 = 243
220 – 139 = 81
139 – 112 = 27
112 – ? = 9
? – 100 = 3
So, ? = 112 – 9 = 103

3. a) 28

Solution:
17 +13 = 30
30 – 9 = 21
21 +13 = 34
34 – 9 = 25
25 + 13 = 28

4. b) 257

Solution:
31 + (1³ + 1) = 31 + 2 = 33
33 + (2³ - 1) = 33 + 7 = 40
40 + (3³ + 1) = 40 + 28 = 68
68 + (4³ - 1) = 68 + 63 = 131
131 + (5³ + 1) = 131 + 126 = 257

5. c) 176

Solution:

Thanks.

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