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