Question
(a) Suppose $\left(\begin{array}{l}n \\ 11\end{array}\right)=\left(\begin{array}{l}n \\ 7\end{array}\right)$. What is $n$ ?(b) Suppose $\left(\begin{array}{c}18 \\ r\end{array}\right)=\left(\begin{array}{c}18 \\ r-2\end{array}\right)$. what is $r$ ?
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