Find the missing number in the series?

4, 18, ?, 100, 180, 294, 448

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

2, 4, 6, 8, ?, 12

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

4, 5, 8, 9, 12, 13, ?

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

41, 54, 67, ?, 93

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.

144, 139, 133, 128, ?, 117, 111

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

21, 11, 32, 43, 75, ?

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

831, 842, 853, 864, 875, ?

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

8, 16, ?, 64, 128