Number Series-Test 3 (Finding the missing term)

16)

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

6, 42, ?, 1260, 5040, 15120, 30240

[Bank of India, 2010]
Discussion
17)

2, 8, 26, ?, 242

[Andhra Bank (PO), 2010]
Discussion
18)

3, 4, 12, ?, 196

[Andhra Bank (PO), 2010]
Discussion
19)

9, 17, ?, 65, 129

[Andhra Bank (PO), 2010]
Discussion
20)

7, 13, ?, 49, 97

[Andhra Bank (PO), 2010]
Discussion

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