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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.

3, 4, 7, 7, 13, 13, 21, 22, 31, 44,

Option:
A. 42
B. 43
C. 51
D. 52
Answer: B . 43

Justification:

The given sequence is a combination of two series :
I.    Odd numbered terms i.e. 3, 7, 13, 21, 31, (....)
II.   Even numbered terms i.e. 4, 7, 13, 22, 44.
The pattern in I is + 4, + 6, + 8, + 10,....
The pattern in II is + 3, + 6, + 9, + 12,.....
.'. Missing term = 31 + 12 = 43.


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