What will come in place of question mark (?) in the given number series?
The pattern followed is :
5 $$\times 1.5$$ = 7.5
7.5 $$\times 2$$ = 15
15 $$\times 2.5$$ = 37.5
37.5 $$\times 3$$ = 112.5
112.5 $$\times 3.5$$ = 393.75
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