SSC CGL 2016 Tier 1, 4 Sept Question 9

9.A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
5, 10, 30, ?, 600, 3600
A. 120
B. 100
C. 90
D. 60
Answer: A
5, 10(5 X 2), 30(10 X 3), 120(30 X 4) , 600 (120 X 5), 3600(600 X 6)