Find the missing number?

A. 81

B. 90

C. 87

D. 103

Answer: Option B

Solution(By Examveda Team)

Moving left to right, the numbers represent multiples of 12, subtracting 1, for the first step, adding 2 for the second, subtracting 3 for the third, adding 4 for the next etc. etc. So,

12 * 7 + 6 = 90.