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