What is the next letter in the series: A, C, E, G, ?

A. I

Find the odd one out in the series: A, D, G, J, K, N

A. K

What number should come next in the series: 3, 6, 11, 18, ?

A. 25

Complete the series: a, c, e, g, ?

B. H

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

A. R