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n/18 > 1/3
n > 18/3
n > 6
n/18 < 5/6
n < 15
Por lo tanto existen 14-7+1 = 8 fracciones que satisfacen las condiciones dadas
7/18, 8/18, 9/18, 10/18, 11/18, 12/18, 13/18, 14/18