\[^{n-1}{{C}_{r}}=({{k}^{2}}-3)\,.{{\,}^{n}}{{C}_{r+1}}\] if \[k\in \] – McqOptions

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1.	\[^{n-1}{{C}_{r}}=({{k}^{2}}-3)\,.{{\,}^{n}}{{C}_{r+1}}\] if \[k\in \] [IIT Screening 2004]
A.	\[[-\sqrt{3},\,\sqrt{3}]\]
B.	\[(-\infty ,\,-2)\]
C.	\[(2,\,\infty )\]
D.	\[(\sqrt{3},\,2)\]
Answer» E.

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