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In "Number Series" question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces

In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.

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

Option:
A. 9
B. 10
C. 11
D. 12
Answer: B . 10

Justification:

The given sequence is a combination of three series :
I.    1st, 4th, 7th, 10th, 13th term  i.e. 2, 4, 6, 8, (....)
II.   2nd, 5th, 8th, 11th term  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 number is 10.

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