Number Series Questions

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

1728, 864, 432, 216, ?

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.

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

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

57, 54, 48, 39, ?, 12

Find the next number in the given number series?

8, 11, 19, 23, 32, ?

Find the first negative term of the below A.P.

129, 120, 111, 102, ...

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.

23, 23, 46, 138, 552, ?