Number Series Questions

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

12, 17, 34, ?, 78, 83, 166

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

15, 7.5, 7.5, ?, 22.5, 56.25

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

63, 56, 50, 43, 37, 30, ?

Which number will fit both the series of numbers?

Series A : 1, 4, 9,...
Series B : 1, 8, 27,...

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

64, 75, 86, 97, ?, 119

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

131, 138, 145, 152, ?, 166

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

67, 80, 93, ?, 119, 132

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

87, 62, 42, 27, 17, ?