pola 1 = 1
pola 2 = 2 + 1 = 3
pola 3 = 3 + 2 + 1 = 6
pola 12 = 12 + 11 + 10 +........+ 1 = 78
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pola 1 = 1
pola 2 = 2 + 1 = 3
pola 3 = 3 + 2 + 1 = 6
pola 12 = 12 + 11 + 10 +........+ 1 = 78