What will come in place of question mark (?) in the following number series?
17, 9, ?, 16.5, 35, 90
[United Bank of India, 2009]
12, 12, 18, 45, 180, 1170, ?
[United Bank of India, 2008]
444, 467, 513, 582, 674, 789, ?
[United Bank of India, 2008]
1, 16, 81, 256, 625, 1296, ?
[United Bank of India, 2008]
23, 25, 53, 163, 657, 3291, ?
[United Bank of India, 2008]
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