Find the missing number in the given series: 11, 33, 55, ……… 99.

Find the missing number:

11:13::31: .....

Fill in the missing number in the series

3, 6, 18, 9, 18, 54, 27, 54, 162

The next number of the sequence 1, 4, 10, 19, 31, ......... is

find the missing number

8, 11,15, 22, 33, 51, ......, 127, 203

find the missing number

3, 28, 4, 65, 5, 126, 6, ..........?