Series Completion - Verbal and Reasoning

Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Q1:

66, 36, 18, ?

A 3

B 6

C 8

D 9

ANS:C - 8

Explanation: Each term in the series is the product of the digits of the preceding term. So, missing term = 1 x 8 = 8.