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  • E x E x E = EE x E x O = EE x O x E = EO x E x E = EO x O x E = EO x E x O = EE x O x O = E

    But... O x O x O = Odd

    1 - P(odd) = P(even)

    4/9 x 3/8 x 2/7 = 24/504 = 1/21

    P(even) = 1 - (1/21) = 20/21