Find the missing number?

A. 71

B. 67

C. 77

D. 73

Answer: Option A

Solution(By Examveda Team)

As you move left to right, numbers follow the sequence of Square Numbers, from 36 to 121, subtracting 10 for the second number, 20 for the next, then 30 etc. So,

36
49 - 10 = 39
64 - 20 = 44
81 - 30 = 51
100 - 40 = 60
So,

121 - 50 = Missing Number
Missing Number = 71.