Find the missing term: 3, 4, 7, 7, 13, 13, 21, 22, 31, 34, ?

A. 42

B. 43

C. 51

D. 52

Answer: Option B

Solution(By Examveda Team)

The given sequence is a combination of two series:
I. 3, 7, 13, 21, 31, ? and
II. 4, 7, 13, 22, 34
The pattern in I is + 4, + 6, + 8, + 10,......
The pattern in II is + 3, + 6, + 9, + 12,..............
So, missing term = 31 + 12 = 43