zmetz405
27.06.2019 •
Mathematics
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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Ответ:
72=n(n-1)
n=8=days
1+2+3+...=n(n-1)/2
Ответ:
2
Step-by-step explanation:
la respuesta es 2