\left. \begin{array} { l } { \frac { n ! } { 3 ! ( n - 3 ) ! } : \frac – InterviewSolution

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1.	\left. \begin{array} { l } { \frac { n ! } { 3 ! ( n - 3 ) ! } : \frac { n ! } { 5 ! ( n - 5 ) ! } = 5 : 3 } \\ { \frac { n ! } { 3 ! ( n - 5 ) ! } : \frac { n ! } { 5 ! ( n - 7 ) ! } = 1 : 6 } \end{array} \right.
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