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Property (iv) If ^nCx=^nCy; then either ...

Property (iv) If `^nC_x=^nC_y`; then either x=yx=y or x+y=nx+y=n (v) r.nC_r=n. (n-1)C_(r-1)r.nC_r=n. (n-1)C_(r-1)

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