Algebra question for growth and decay?

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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, ...show more
Best AnswerAsker's Choice
an = an – 1 + 3(n – 1)
--------------------------------
verify:
a3=9
a4 = a3+3(4-1)
a4 = 9 +3(3) = 18

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