2,6,14,30,62,? | series Logical reasoning | WBCS

Complete the series by finding the missing number from the given options.
2,6,14,30,62,?

(a) 126
(b) 128
(c) 120
(d) 130

Correct Answer: a

Solution: 

2+4=6

6+8=14

14+16=30

30+32=62

62+64=126