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Question

For 2rn,(rn)+2(r1n)+(r2n)

A
(r1n+1)
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B
2(r+1n+1)
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C
2(rn+1)
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D
(rn+1)
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Solution

The correct option is D (rn+1)
nCr+2nCr1+nCr2
=(nCr+nCr1)+(nCr1+nCr2)
=n+1Cr+n+1Cr1=n+2Cr(d)

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