What number should replace the question mark in the series: 1, 4, 9, 16, ?, 36

A. 25

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

A. 63

What is the missing number in the series: 10, 20, 40, 80, ?, 320

A. 160

If '?' means 'greater than', '?' means 'less than', '?' means 'equal to', and '?' means 'not equal to', which of the following is a correct statement? 5 ? 3 ? 5 ? 2 ? 1?

A. TRUE

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

B. H