If 1 = Single, 2 = Double, 3 = Triple, 4 = Quadruple, what are 5, 6, 7, 8, etc. called?
If [math]1\circ4=5[/math] and [math]2\circ5=12[/math] and [math]3\circ6=21[/math] then what is [math]8\circ11[/math]? Fun…