Find the missing number in the series: 5, 10, 20, 40, ?

A. 80

Identify the missing term in the series: 1, 4, 9, 16, ?, 36

B. 25

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