Find the missing number?

A. 19

B. 25

C. 21

D. 28

Answer: Option C

Solution(By Examveda Team)

Logic ( Row-wise):
First Element + Second element = Result
2 * Result + 1 = Third element.

So, Missing number,
3 + 7 = 10
2 * 10 + 1 = x
x = 21.
Required Number = 21.