If 8:64 is related as 9:81, what is the relationship between the pairs?

C. SQUARE OF THE FIRST NUMBER
Posted in:  Number Analogy -  Analogy -  Verbal Reasoning

If the letters are arranged in reverse order, what is the 15th letter?

C. N

In the series A, B, C, D, E, F, G, H, I, J, how many letters are before 'F'?

B. 5

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

B. 32

Identify the missing number in the series: 3, 7, 15, 31, ?, 127

A. 63