Find the missing number in the series:

2, 6, 10, 3, 9, 13, 4, 12, ....

Find the missing number of the series. 1, 2, 8, 33, 148, _____ , 4626. 

The next number in the series 2, 6, 24, 120, .... is:

The next number in the series 6, 13, 21, 30, –––– is.

Find out the missing number from the alternatives in the following number series 118? 27964:

Which of the missing numbers will complete the series?

7, 10, 9, 12, 11, –––, –––.