Question

Will someone help me work this out? I don't even know where to begin.

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 5 interactions.
If there are 4 children, there can be 14 interactions.

Which recursive equation represents the pattern?

Answer 1

@sleepyjess @AJ01