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How do I determine the probability of selecting a card greater than 9 or a black card?

  • Probability -

    Black cards = 26/52

    Cards greater than 9 = 10, jack, queen, king, and depending how you value it, ace

    With just the first 4 = (4+4+4+4)/52

    The either-or probability is determined by adding the individual probabilities.

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