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    In a 52 card deck there are: - 4 suits - 13 cards per suit.

    We want to find: P(2 cards of same suit wo/ replacement)

    Favorable outcomes: 13C2 = 13!/2!(13-2)!

    Total possibilities: 52C2 = 52!/2!(52-2)!

    Since there are 4 suits: P(X) = 4 * 13C2/52C2