Which number will come next in the following series? 8, 15, 28, 53, ?

What will be the next number in the following number series? 48, 24, 72, 36, 108, ?

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

Which number is unsuitable in the following series? 5, 3, 6, 10, 9, 12, 17, 15, 18, 23

Find the next term in the following number series : 2, 7, 24, 77, 238, ……..

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