What will come in place of question mark (?) in the given number series ?
The pattern is :
17 $$\times 0.5 + 0.5$$ = 9
9Â $$\times 1 + 1$$ =Â 10
10Â $$\times 1.5 + 1.5$$ =Â 16.5
16.5Â $$\times 2 + 2$$ = 35
35Â $$\times 2.5 + 2.5$$ =Â 90
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