What will come in place of question mark (?) in the following number series?
655, 439, 314, 250, 223, (?)
[Punjab national Bank, 2011]
9, 19, 40, 83, ?, 345, 696
[Punjab national Bank, 2011]
2011]
980, 484, 236, 112, 50, ?, 3.5
[Punjab national Bank, 2011]
8, 9, 20, 63, 256, 1285, ?
[Punjab national Bank, 2011]
1015, 508, 255, 129, 66.5, ?, 20.875
[Punjab national Bank, 2011]
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