If an=∑r=0n 1 nCr, then ∑r=0n r nCr is equal to

# is equal to

1. A

$\left(\mathrm{n}-1\right){\mathrm{a}}_{\mathrm{n}}$

2. B

${\mathrm{na}}_{\mathrm{n}}$

3. C

$\frac{1}{2}{\mathrm{na}}_{\mathrm{n}}$

4. D

None of these

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