Contaminants in cotton are known

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

21, 42, 67, 96, ?, 166

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

7, 11, 19, 35, 67, ?

204, 401, 640, ?, 1105, 1406

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

11, 13, 19, ?, 51, 81

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

7, 14, 30, 66, 146, ?

150     15      3      ?      0.36       0.18

4, 12, 36, 108, ?, 396

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

1, 2, 6, 24, 120, ?

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


2, 5, 10, 17, 26, ?, 50

63 131 267 ? 1083 2171