nCr =কত ?
A \(\frac{{n!}}{{\left( {n - r} \right)!r!}}\)
B \(\frac{r}{{\left( {n - 1} \right)!}}\)
C \((r - 1)!{ \times ^n}{C_r}\)
D \(\frac{{n!}}{{\left( {n - r} \right)!}}\)
Solution
Correct Answer: Option A
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