20, 21, 19, 16, 17, 13, 14, 11, ?

4, 4, 8, 24, 96, 480, (?)

Which is the number that comes next in the following sequence?
4, 6, 12, 14, 28, 30, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

JI, LK, NM, ? 

Complete the following number series.
10 , 17, 26, 37, ____

6, 42, ?,  1260, 5040, 15120, 30240

In the following question, select the figure from the given alternatives in place of the question mark.

In each of the following questions, a sequence is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
2, 3, 5, 9, 17, ?