Find the missing number?

A. 2

B. 5

C. 1

D. 3

Answer: Option A

Solution(By Examveda Team)

Working in rows, the sum of numbers in each row follows the sequence 5, 10, 15, 20, 15, 10, 5. So,

Sum of the middle = 20
1 + 3 + 7 + x + 1 + 4 + 2 = 20
x = 20 - 18 = 2.
Missing element = 2.