Find the missing number?

A. 12

B. 7

C. 10

D. 3

Answer: Option B

Solution(By Examveda Team)

Logic (Row-wise):
Element at Middle = Difference of two left element + difference of two right element.

Thus,
x = 5 - 1 + 4 -1
x = 4 + 3
x = 7.
Missing number = 7.