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

A. E

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

A. 16

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

C. H

In the series X, Y, ?, A, B, what letter should replace the question mark?

A. Z

What character should replace the question mark in the pattern X, Y, Z, A, B, ?

A. C