What will come in place of question mark (?) in the following number series?
1338, 447, 150, 51, 18, ?
[RBI, 2015]
10, 12, 18, 30, 50, ?
[RBI, 2015]
3.9, 5.1, 7.5, 11.1, ?, 21.9
[RBI, 2015]
7, 9, 22, 72, 296, ?
[RBI, 2015]
113, 120, 106, 127, 99, ?
[RBI, 2015]
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