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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

Complete the Given Series

Find out the missing number in the following sequence :
1, 3, 3, 6, 7, 9, ?, 12, 21.

Option:
A. 10
B. 11
C. 12
D. 13
Answer: D . 13

Justification:

Clearly, the given sequence is a combination of two series :
I. 1, 3, 7, ?, 21   and
II. 3, 6, 9, 12
The pattern followed in I is + 2, + 4, ...; and
the pattern followed in IIis + 3.
Thus, missing number = 7 + 6 = 13.
Hence, the answer is (d).

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