What will come in place of question mark (?) in the following number series?
52, 26, 26, 39, 78, ?, 585
[Punjab national Bank, 2010]
7, 20, 46, 98, 202, ?
[Corporation Bank (PO), 2010]
210, 209, 213, 186, 202, ?
[Corporation Bank (PO), 2010]
27, 38, 71, 126, 203, ?
[Corporation Bank (PO), 2010]
435, 354, 282, 219, 165, ?
[Corporation Bank (PO), 2010]
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