Number Series-Test 1 (Finding the missing term)

21)

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

2, 28, 252, 1008, 4032, 36288, ?

[Allahabad Bank, 2011]
Discussion
22)

15, 21, 39, 77, 143, (?)

[Corporation Bank, 2011]
Discussion
23)

33, 39, 57, 129, (?)

[Corporation Bank, 2011]
Discussion
24)

15, 19, 83, 119, 631, (?)

[Corporation Bank, 2011]
Discussion
25)

19, 26, 40, 68, 124, (?)

[Corporation Bank, 2011]
Discussion

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