Which number replaces the question mark ?

A 6

B 12

C 9

D 8

Solution

Correct Answer: Option A

Solution:

4 + 2 = 6

6 + 3 = 9

9 + 10 = 19

তাহলে 1 + ? = 7 হবে

সেক্ষেত্রে ? = 7 - 1 = 6.