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What will come in place of the question mark (?) in the following number series ?
The pattern is :
12 $$\times 0.5 + 0.5$$ = 6.5
6.5 $$\times 1 + 1$$ = 7.5
7.5 $$\times 1.5 + 1.5$$ = 12.75
12.75 $$\times 2 + 2$$ = 27.5
27.5 $$\times 2.5 + 2.5$$ = 71.25
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