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OpenStudy (anonymous):
A playground is being designed where children can interact with their friends in certain combinations. If there is 1 child, there can be 0 interactions. If there are 2 children, there can be 6 interactions. If there are 3 children, there can be 15 interactions. If there are 4 children, there can be 27 interactions. How many interactions will there be for 7 children? 60 81 105 108
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