What will come in place of the question mark (?) in each of the following number series.
31, 15, 21, 50, ?, 767.25
The pattern followed is :
31 $$\times 0.5 - 0.5$$ = 15
15 $$\times 1.5 - 1.5$$ = 21
21 $$\times 2.5 - 2.5$$ = 50
50 $$\times 3.5 - 3.5$$ = 171.5
171.5 $$\times 4.5 - 4.5$$ = 767.25
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