To prove: The formula ∑ r , s , t ≥ 0 r + s + t = n ( m 1 r ) ( m 2 s ) ( m 3 t ) , Where the summation spreads over all nonnegative integers r , s and t with sum r + s + t = n .

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Chapter 5, Problem 29E

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To prove: The formula ∑r,s,t≥0r+s+t=n(m1r)(m2s)(m3t), Where the summation spreads over all nonnegative integers r,s and t with sum r+s+t=n.

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