Indian Financial  System Code (IFSC) is  a / an

What should come in place of (?) question mark in the following number series.

256, 128, 64, 32, 16, ?

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

4, 3, 7, 26, 101, ?

10, 10, 15, 30, 75, ?

17, 36, 65, 104, 153, ?

3, 10, 29, 66, ?

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

48, 291, ?,  399, 408, 411

What should come in place of (?) question mark in the following number series.

1, 2, 6, 24, 120, ?

Find the missing number in the given number series.

?, 26, 38, 70, 130, 226

92, 88, 79, ? , 38, 2

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

120, 130, ?, 140, 100, 150