What will come in place of the question mark (?) in the given number series?
17, 9, 15, 40, 143.5, ?
The pattern here followed is that in each term 1 is added and then odd multiples of $$\frac{1}{2}$$ are multiplied.
$$(17 + 1) \times \frac{1}{2}$$ = 9
$$(9 + 1) \times \frac{3}{2}$$ = 15
$$(15 + 1) \times \frac{5}{2}$$ = 40
$$(40 + 1) \times \frac{7}{2}$$ = 143.5
$$(143.5 + 1) \times \frac{9}{2}$$ = 650.25
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