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April 19, 2014

Homework Help: math

Posted by Anonymous on Saturday, September 15, 2012 at 10:29am.

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 only 1 interaction.
If there are 3 children, there can be 4 interactions.
If there are 4 children, there can be 9 interactions.

How many interactions will there be for 8 children?

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