Complete the series: m, n, o, p, ?

A. Q

Identify the missing letter in the series: Z, X, V, T, ?

A. R

Identify the missing letter in the series: Z, X, V, T, ?

D. U

What is the missing number in the series: 2, 6, 12, 20, ?, 42?

B. 32

What is the missing term in the series: 3, 7, 15, 31, ?, 127?

A. 63