Question
If ${ }^{n} C_{r}=x .{ }^{n} P_{r}$, find the values of $x$.
Step 1
{ }^{n} P_{r}$. We know that ${ }^{n} C_{r}$ is equal to $\frac{n!}{r!(n-r)!}$ and ${ }^{n} P_{r}$ is equal to $\frac{n!}{(n-r)!}$. Show more…
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