Find the missing number?

A. 4

B. 1

C. 0

D. 7

Answer: Option A

Solution(By Examveda Team)

Working in rows from top to bottom, the sum of the digits in each row increases by 2 each time, from 20 to 30. So,

Sum of the last row = 30
9 + 9 + 2 + 1 + 5 + x = 30
x = 30 - 26 = 4.
x = 4.