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

A. 160

What is the missing number in the series: 12, 24, 48, 96, ?, 384

A. 192

What is the next number in the series: 12, 24, 48, 96, ?

A. 192

Find the missing number in the series: 5, 11, 23, 47, ?

A. 95

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

A. 63