A playground is being designed for children can interact with their friends and certain combinations there is one child there can be zero interactions if there two children there can be one interaction if there are three children there can be four interactions if there are four children there can be nine interactions how many interactions with there be for six children a 11 interactions D 16 interactions c25 interactions D 36 interactions

Question

anonymous · Answer

something along 1,4,9,16,25,36... maybe?

anonymous · Answer

oh wait, i missed 11 :D nvm

anonymous · Answer

The pattern could be $(n-1)^2$, but I don't see the combinatoric merit to that.

anonymous · Answer

and use punctuation! I was reading the question in one breath!