What character should replace the question mark in the sequence: A, B, C, ?, E?

A. D

In the series: 1, 4, 9, ?, 25, what number should replace the question mark?

A. 16

What character should be placed in the blank: 2, 4, 8, ?, 32?

B. 16

In the sequence: A1, B2, C3, ?, E5, what is the missing term?

A. D4

In the sequence A, B, C, ?, E, F, what character should replace the question mark?

A. D