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Prove-that-r-0-n-r-n-C-r-z-r-nz-1-z-n-1-




Question Number 23644 by Tinkutara last updated on 03/Nov/17
Prove that Σ_(r=0) ^n r.^n C_r  z^r  = nz(1 + z)^(n−1)
Provethatnr=0r.nCrzr=nz(1+z)n1

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