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19 September, 23:13

Brian rented a book from the book shop. The shop charges $2 for the first day and $3 from the second day onwards. Brian took more then 2 days to return the book and he paid $35 while returning the book. How many days did he keep the book with him?

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  1. 20 September, 01:49
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    36=n (n-1) / 2=35+1, because it begun from2

    72=n (n-1)

    n=8=days

    1+2+3 + ... = n (n-1) / 2
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