Identify the pattern: 1, 1, 2, 3, 5, 8, ?

D. 13

What comes next in the series: Z, Y, X, W, ?

A. V

If the pattern is to add 3 to the position of each letter, what letter corresponds to the position of 10?

B. K

In the series 2, 4, 8, 16, what is the next number?

C. 32

Which of the following does not belong in the series: 3, 6, 9, 12, 15, 18, 20?

D. 20