R n C r -A- n -1 -n-1 C r -1B- n - n -1 C r -1C- n - C r -1-n-1D- n -1 C - C -1- n -1

The correct option is B n · nbsp; ^n 1 C _r 1 ^n C _r nbsp;= nbsp; n/r× ^n 1 C _r 1 ⇒ r × ^n C _r = n × nbsp; nbsp;^n 1 C _r 1 ...

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General Term of Binomial Expansion

r n C r =A. n...

Question

$r \cdot^{n} C_{r} =$

$(n - 1) \cdot^{n - 1} C_{r - 1}$

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$n \cdot^{n - 1} C_{r - 1}$

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$\frac{^{n - 1} C_{r - 1}}{(n - 1)}$

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$\frac{^{n - 1} C_{r - 1}}{(n - 1)}$

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Solution

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Similar questions

If $1 \leq r \leq n$ then $n^{n - 1} C_{r - 1}$ is equal to .........

$^{n} C_{r} +^{n} C_{r - 1}$ is equal to

^{n} C_{r} +^{n} C_{r - 1}

$^{n} C_{r} + 2^{n} C_{r - 1} +^{n} C r - 2$ =

\frac{{}^{n}C_{r}}{{}^{n}C_{r - 1}} = \frac{n - r + 1}{r}

\frac{{}^{n}C_{r}}{{}^{n - 1}C_{r - 1}} = \frac{n}{r}

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