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to win 1 million dollars,you must draw two cards whose sum is 9 , from a stack of cards numbered 1 though 10 .After the first draw, you replace the card and shuffle the stack again for for the second draw. Wat is the chance your two cards will have a sum of nine?

  • math -

    Here are the possible ways to sum 9 with 2 cards.

    8 + 1
    7 + 2
    6 + 3
    5 + 4
    1 + 8
    2 + 7
    3 + 6
    4 + 5

    Each pair has the probability of (1/10)^2. The probability of either-or events is determined by the sum of the individual events.

    I hope this helps.

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