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    p1= (4/7) * (5/9) * (4/8)

    p2 = (4/7) * (4/9) * (4/8)

    p3 = (3/7) * (5/9) * (4/8)

    p_total=p1+p2+p3

    numerator = 80+64+60 denominator=504

    def gcd(a,b): while b !=0: a,b =b, a%b return a

    g=gcd(numerator,denominator)

    numerator //=g denominator //=g

    print(f"{numerator}/{denominator}")