See the rachurado is the x², and this is to study, isn't easy to see because I place all the possilities 7 graphic, what the diferences
one is n*(n-1) and n*(n+1) comparisions
the other is n*(n-1)/2 and n*(n+1)/2
The professor kick my ass with that but see the X was based in values if I do that I am not resolving combinatory, that professor.
But had that for combinatory you can imagine that the part negative doesn't serve for combinatory.
Rute Bezerra de Menezes Gondim
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