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Summation by Sigma Method

In following ...

Question

In following questions, one term in number series is incorrect.
Find out the incorrect number 1, 5, 5, 9, 7, 11, 11, 15, 12, 17

A

11

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B

12

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C

17

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D

15

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Solution

The correct option is B 12
The given sequence is a combination of two series :
I. 1, 5, 7, 11, 12 and
II. 5, 9, 11, 15, 17
The pattern in both I and II is + 4, + 2, + 4, + 2.
So, 12 is wrong and must be replaced by (11 + 2) i.e. 13.

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