Identify the missing letter in the series: Z, X, V, T, ?

D. U

What is the missing number in the series: 2, 4, 8, 16, ?, 64?

B. 32

Identify the missing number in the series: 12, 24, 48, ?, 192.

B. 96

Find the missing letter in the series: b, d, f, h, ?

A. J

Complete the series: a, c, e, g, ?

B. H