Question: 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.

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? (1 point)

a 49

b 64

c 36

d 40

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