What will come in place of the question mark (?) in the following number series ?
The pattern here is :
4 $$\times \frac{3}{2}$$ = 6
6 $$\times \frac{4}{2}$$ = 12
12 $$\times \frac{5}{2}$$ = 30
30 $$\times \frac{6}{2}$$ = 90
90 $$\times \frac{7}{2}$$ = 315
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