Question: 30. A round-robin tournament, as defined in the previous exercise, is a competition in which each participant plays against every other participant exactly once. Using

30. A round-robin tournament, as defined in the previous exercise, is a competition in which each participant plays against every other participant exactly once. Using a round-robin tournament with n + 1 contestants, give a combinatorial argument for the following identity:

1+2++ n = +n= (n+1). 2

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