Question

Recursive Patterns...??

"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?"

I read the lesson but I still can't figure out how to get the answer. I'm really confused, can anyone explain how to figure this out?

Answer 1

I figured it out, the answer was 49 :)