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

B. 25

What number should replace the question mark in the series: 1, 2, 4, 8, 16, ?

B. 32

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

B. H

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

B. H

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

C. 80