Let n 2 N. Prove .x C y C z/n D X aCbCcDn n a b c! x ay b z c where the sum is over all
Chapter 17, Problem 17.31(choose chapter or problem)
Let n 2 N. Prove .x C y C z/n D X aCbCcDn n a b c! x ay b z c where the sum is over all natural numbers a; b; c with a C b C c D n.
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