What is the reserve deposit ratio (rdr)?

In each of the following number series, one term is missing. Find the missing term.

50, 45, 37, 26, 12, ?

23 45 89 155 ? 353

? , 864, 432, 144, 36, 7.2

In each of the following number series, one term is missing. Find the missing term.

5, 10, 20, 40, ?, 160

1, 26, 75, 156, 277, ?

What will come in place of the question mark (?) in the following series?

6, 13, 29, 63, ?, 259

18, 30, 54, 90, 138, ?

200 ? 96 38.4 7.68 0

Find the next term in the series:

3, 10, 21, 36, 55, ?

What value should come in the place of (?) in the following number series?

100, 149, 68, 189, ?, 245