What is the next letter in the series: A, C, E, G, ?

A. I

What is the missing number in the series: 3, 6, 12, 24, ?

B. 48

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

B. H

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

A. J

What number should replace the question mark in the series: 1, 1, 2, 3, 5, ?

A. 7