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A person is permitted to selected at least one and at most `n` coins from a collection of `(2n+1)` distinct coins. If the total number o ways in which he can select coins is 255, find the value of `ndot`

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A student is allowed to select at most n books from a collection of (2n+1) books .If the total number of ways in which he can select books is 63 find the value of n.

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