What will come in place of the question mark (?) in the following number series ?
The pattern here followed is :
40 * $$\frac{1}{2}$$ = 20
20 * $$\frac{3}{2}$$ = 30
30 * $$\frac{5}{2}$$ = 75
75 * $$\frac{7}{2}$$ = 262.5
262.5 * $$\frac{9}{2}$$ = 1181.25
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