2, 1, 2, 4, 4, 5, 6, 7, 8, 8, 10, 11, ?

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Question

2, 1, 2, 4, 4, 5, 6, 7, 8, 8, 10, 11, ?

Options:

A . 9

B . 10

C . 11

D . 12

Answer: Option B
The given sequence is a combination of three series :
I. 1st, 4th, 7th, 10th, 13th terms i.e. 2, 4, 6, 8, ?
II. 2nd, 5th, 8th, 11th terms i.e. 1, 4, 7, 10
III. 3rd, 6th, 9th, 12th terms i.e. 2, 5, 8, 11
Clearly, I consists of consecutive even numbers. So, the missing term is 10.

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