What will come in place of question mark (?) in the following number series?
649.6875, 1299.375, 866.25, 346.5, 99
[Uttrakhand GBOP, 2007]
30, 16, 10, 8, 8, 9, ?
[Uttrakhand GBOP, 2007]
10, 18, 63, 253, 1137, 5901, ?
[Uttrakhand GBOP, 2007]
11, 26, 58, 124, 258, 528, ?
[Uttrakhand GBOP, 2007]
738, 765, 819, 900, 1008, 1143, ?
[Uttrakhand GBOP, 2007]
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