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OpenStudy (anonymous):
If there is 1 child, there can be 0 interactions. If there are 2 children, there can be 3 interactions. If there are 3 children, there can be 9 interactions. If there are 4 children, there can be 18 interactions. How many interactions will there be for 9 children? 135 84 93 108 How would I solve this?
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OpenStudy (anonymous):
is it \(a_n=a_{n-1}+3(n-1)\)?
OpenStudy (anonymous):
Ok so would An =9 and n =3?
OpenStudy (anonymous):
oh never mind I got it. Thank you so much :)
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