Find the missing number?

A. 22

B. 6

C. 8

D. 36

Answer: Option B

Solution(By Examveda Team)

Logic:
First element From left + First element from Right - 3 = Second element from Left.
Second Element from Left + Second Element from last - 3 = Third Element from left.
An so on.

Thus, required number,
4 + x - 3 = 7
x = 6.