# A/2. B/4, C/8, D/16,..

(a) E/18, F/20

(b) E/32, F/64

(c) E/18, F/22

(d) E/20, F/32

**Answer: (b) E/32, F/64. **

**Solution:-**

A + 1 = B & 2 x 2 = 4,

B + 1 = C & 4 x 2 = 8,

C + 1 = D & 8 x 2 = 16,

Same as,

D + 1 = E & 16 x 2 = 32.

E + 1 = F & 32 x 2 = 64.

Hence, the correct answer is option (b) E/32, F/64.