The coefficients of the \( (r-1) \) th, \( r \) th and \( (r+1) \) ...

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The coefficients of the \( (r-1) \) th, \( r \) th and \( (r+1) \) th terms in the expansion of \( (x+1)^{n} \) are in the ratio \( 1: 3: 5 \). Find \( n \) and \( r \).
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