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Question

Prove that
(C0+C1)(C1+C2)(C2+C3)(C3+C4).....(Cn1+Cn)=C0C1C2....Cn1(n+1)nn!

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Solution

LHS=(C0+C1)(C1+C2)(C2+C3)....(Cn1+Cn)

=nr=1(Cr1+Cr)

=nr=1 n+1Cr(nCr+nCr1=n+1Cr)

=nr=1(n+1r)nCr1 (nCr=nrn1Cr1)
=r=1n(n+1)r=1n1/rnr=1 nCr1

=(n+1)n1n!(C0C1....Cn1)

=(n+1)nn!(C0C1.......Cn1)=RHS

Hence proved.

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