Q.11. Find the wrong number in the following series.
13, 18, 25, 30, 37, 40
(A) 30
(B) 25
(C) 40
(D) 37
Ans . C
The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong.
Q.12. Look at this series: 8, 6, 9, 23, 87 , ... What number should come next?
(A) 226
(B) 128
(C) 429
(D) 324
Ans . C
Q.13. Look at this series: 2, 6, 18, 54, ... What number should come next?
(A) 148
(B) 108
(C) 216
(D) 162
Ans . D
This is a simple multiplication series. Each number is 3 times more than the previous number.
Q.14. Find the wrong number in the following series.
15 46 63 71 75 77 78
(A) 46
(B) 15
(C) 71
(D) 63
Ans . A
In this question, if you start from the beginning, firstly the difference is 31, then the difference is 17, then the difference is 8. So there is no logic. If you start backwards, you can see that firstly, 1 is added, then 2 is added, then 4 is added, then 8,16 and 32 should have been added. So you have got the right clue. So 15 + 32 the first number should be 47 and afterwards, the series becomes + 16, + 8, + 4and so on.
Q.15. Look at this series: 5.2, 4.8, 4.4, 4, ... What number should come next?
(A) 3.3
(B) 3
(C) 3.6
(D) 3.5
Ans . C
In this simple subtraction series, each number decreases by 0.4.
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