\begin{array}{l}{\text { Find } r \text { if }(a)^{14} C_{2 r} \cdot^{ – InterviewSolution

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1.	\begin{array}{l}{\text { Find } r \text { if }(a)^{14} C_{2 r} \cdot^{10} C_{2 r-4}=143 : 10} \\ {\text { (b) }^{10} C_{r+2} :^{10} C_{r}=10 : 21}\end{array}
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