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What will come in place of the question mark (?) in the following number series?
The pattern followed is :
10 $$\times \frac{3}{2}$$ = 15
15 $$\times \frac{4}{2}$$ = 30
30 $$\times \frac{5}{2}$$ = 75
75 $$\times \frac{6}{2}$$ = 225
225 $$\times \frac{7}{2}$$ = 787.5
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