If the sequence is A, C, E, G, what is the next letter?

B. H

In the series 2, 4, 8, 16, what is the next number?

C. 32

Identify the pattern: 3, 6, 11, 18, ?

A. 27

What comes next in the series: Z, Y, X, W, ?

A. V

Find the missing number in the series: 5, 10, 20, ?, 80

B. 40