The missing number (?) in the following series : 60, 180, 90, 270, ?, 405 is

The missing number (?) in the following series is : 3, 7, 15, 31, 63, ?

The missing number in the series is: 4, 18, 48, ?, 180

Find the missing number in the following number series. 3, 5, 8, 10, ?, 15, 18, 20

Find the missing number in the following series. 2/3, 4/7, ?, 11/21, 16/31

In the following question, select the missing number of the given series. 94, 105, 92, 107, 90, ?