Find the missing number?

A. 11

B. 9

C. 15

D. 12

Answer: Option D

Solution(By Examveda Team)

Working from the bottom row to the apex of the triangle, the sum of the values in each row follows the sequence 15, 14, 13,12.

8 + 2 + 1 + 4 = 15
7 + 3 + 4 = 14
6 +7 = 13
So,
Top Element = 12.