\begin{aligned}
&\text { The number of elements in the set }\\
&S=\left\{(r, k): k \in \boldsymbol{Z} \text { and }{ }^{36} C_{r+1}=\frac{6\left({ }^{33} C_r\right)}{\left(k^2-3\right)}\right\}_{, \text {is : }}
\end{aligned}
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