Question
3, 4, 7, 7, 13, 13, 21, 22, 31, 34, ?
A. 52
B. 51
C. 42
D. 43
Answer: D
Solution:
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