Number Series-Test 4 (Finding the next term)

11)

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

13, 13, 65, 585, 7605, 129285 ?

[United Bank of India, 2008]
Discussion
12)

2187, 729, 243, 81, 27, 9, ?

[United Bank of India, 2008]
Discussion
13)

522, 1235, 2661, 4800, 7652, 11217 ?

[United Bank of India, 2008]
Discussion
14)

51975, 9450, 2100, 600, 240, 160, ?

[United Bank of India, 2008]
Discussion
15)

4, 18, 48, 100, 180, 294, ?

[United Bank of India, 2008]
Discussion

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