JEE Math Practice Question
${ }^{n-1} C_r=\left(k^2-8\right){ }^n C_{r+1}$ if and only if :
- A.$2 \sqrt{2}<\mathrm{k}<2 \sqrt{3}$
- B.$2 \sqrt{2}<\mathrm{k} \leq 3$
- C.$2 \sqrt{3}<\mathrm{k}<3 \sqrt{3}$
- D.$2 \sqrt{3}<\mathrm{k} \leq 3 \sqrt{2}$
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