If the pattern is 1, 4, 9, ?, 25, what number should replace the question mark?

A. 16

In the pattern X, Y, Z, ?, A, B, what character should fill the gap?

A. W

In a sequence of letters: A, C, E, G, ?, K. What is the missing letter?

B. H

If the pattern is 1, 2, 4, 8, ?, 32, what number should replace the question mark?

A. 16

In a series of numbers: 2, 4, 8, 16, ?, 64, what is the missing number?

B. 32