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Mathematics, 20.04.2020 20:30 amontes189

Andy, bette, cate, dustin, erik, and franco are rock collectors. Each collector has chosen some rocks from his ir her collection to trade. Each collector is going to trade with every other collector. How many different pairs of collectors will trade rocks?

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Andy, bette, cate, dustin, erik, and franco are rock collectors. Each collector has chosen some rock...
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