Mathematics, 11.09.2019 18:10 andrespeerman

Aplayground 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 only 1 interaction. if there are 3 children, there can be 4 interactions. if there are 4 children, there can be 9 interactions. which recursive equation represents the pattern?

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Aplayground is being designed where children can interact with their friends in certain combinations...