Number Series Questions

In the following question, select the missing number from the given series.

6, 9 , 15, 24, 39, 63, ?

In the following question, select the missing number from the given series.

10, 12, 14, 16, 18, ?

What should come in place of question mark (?) in the following number series?

36, 18, 6, 3, 1, ?

In the following question, select the missing number from the given series.

13, 17, 26, 42, 67, ?

In the following question, select the missing number from the given series.

19, 26, 40, 61, ?, 124

In the following question, select the missing number from the given series.

2187, 729, 243, 81, 27, ?

In the following question, select the missing number from the given series.

11, 22, 44, 88, 176, ?

In the following question, select the missing number from the given series.

9, 9, 18, 54, 216, ?