+1 vote
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in Binomial theorem by (199 points)

If x+y=,then r=0n​r2 nCr​xryn−r equals

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1 Answer

+1 vote
by (15.0k points)

=n(n−1)x2+nx
=nx[x(n−1)+1]
=nx[nx−x+(x+y)] ...it is given in the question that x+y=1
=nx[nx+y]

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