Which of the following does not belong to the same category as the others: 1, 3, 5, 7, 10?

D. 10

What is the 7th letter of the English alphabet?

A. G

In the series A, B, C, D, E, F, G, how many letters are there before the letter D?

B. 3

If the letter Z is the 26th letter, what is the 20th letter of the alphabet?

A. T

How many times does the letter 'A' appear in the series: A, B, A, C, A, D, A?

B. 3