Find the odd one out in the series: A, C, E, G, K, I

D. K

Identify the missing letter in the series: m, n, p, q, ?

A. R

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

A. R

Complete the series: a, e, i, o, ?

A. U

Identify the missing letter in the series: m, n, p, q, ?

A. R