Number Series Questions

Which number will fit in '?' place in the following series?

2, ?, 12, 20, 30, 42

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

178, 172, 166, 160, ?, 148

The missing number in the series 9 81 ? 6561 59049

Which number will complete the series?

6 , 8 , 17 , 19 , 28 , 30 , ?

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

28, 30, 36, 48, ?, 98, 140

In the following question, select the missing number from the given series.
13, 27, 56, 115, ?

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

9, 9, 18, 54, 216, ?

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

9, 10, 13, 22, 49, ?