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Of the 10 kids in a chess club, 5 are left-handed and 5 are right-handed. The club holds a round-robin tournament in which every player plays against every other player exactly once. Of all the matches, how many of them have a left-handed player competing against a right-handed player?

 May 24, 2021
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There are 10 matches with a left-handed player competing against a right-handed player.

 Jun 19, 2021

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