What number should replace the question mark in the series: 1, 1, 2, 3, 5, ?

B. 8

Identify the missing term in the series: 3, 6, 11, 18, ?

A. 25

What is the next number in the series: 10, 20, 30, 40, ?

B. 50

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

B. H

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

A. R