Complete the series: 1, 1, 8, 4, 27, 9, ….?

A) 64

B) 20

C) 60

D) 16

When given series is increasing as well as decreasing, there are two series:

First Series             Second Series 

     1                                1

    2³ = 8                         1+3 = 4

     3³ = 27                      4+5=9

    4³ = 64