Which of the following was NOT a feature of the Multi -

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

15, 21, ?, 41.16, 57.624

84, 63, ?,  283.5, 1701

15, 120, 840, 5040, ?, 100800

107       157       194       ?       237       247

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

3.5, 9.5, 27.5, 81.5, 243.5, 729.5, ?

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

4, 40, 30, 300, 290, ?

840, 2520, 630, 3150, ?,  3675

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

17, 81, 131, 169, 197, ?

12, 13, 27, 82, 329, ?

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

10, 17, 26, 37, 50, ?