Number Series Questions

Which one is wrong in the given series?

49 36 25 18 9 4

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

1728, 864, 432, 216, ?

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

13, 17, 19, 23, 29, ?

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

470, 465, 460, 455, ?, 445

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.

91, 100, 118, 145, ?, 226

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

87, 62, 42, 27, 17, ?

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

52, 41, 32, 25, ?, 17