1.  Choose the correct alternative that will continue the same pattern and replace the question mark in the given series : 1, 1, 2, 6, 24, ?, 720

A. 100
B. 104
C. 108
D. 120

Answer: Option D

Explanation:

The pattern is × 1, × 2, × 3, ×4, ..... So, missing term = 24 × 5 = 120.