Odpowiedzi na post #64 085

It is N * (N+1) though 9 = 90: N = 9, so 9 * (9+1) = 90 8 = 72: N = 8, so 8 * (8+1) = 72 7 = 56, 7 * (7+1) = 56 6 = 42, 6 * (6+1) = 42 3 = 12...

X(X+1)=Y 9(9+1)=90 3(3+1)=12 Granted, this is also an idiotic way of presenting the "question" in the first place, because it relies on filling...