64,16,32,8,? | series Logical reasoning | WBCS

Complete the series by finding the missing number from the given options.

64,16,32,8,?

(a) 24
(b) 32 
(c) 4 
(d) 16

Correct Answer: d

Solution: 

Two series

Series 1: 16*2=32, 32*2=64
series 2: 8*2=16
28. Complete the series by finding the missing number from the given options.