Question: 58. By a combinatorial argument, prove that for r n and r m, n+m (+)-(6)()-(0) (-)--(7)(0) m r + r

58. By a combinatorial argument, prove that for r ≤ n and r ≤ m,

n+m ("+")-(6)()-(0) (-)--(7)(0) m r + r

n+m ("+")-(6)()-(0) (-)--(7)(0) m r + r

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