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probability... two dice are tossed.... and their sum is recorded ..find probability p ( sum is between 2 and 9)

  • math -

    Add the probabilities of getting
    I assume you want the probaility of getting 2 to 9 INCLUSIVE. You could add the probabilities of getting
    2,3,4,5,6,7,8 and 9

    OR,
    subtract from 1, the probabilities of getting 10,11, or 12.

    Let's do it the latter way, since it's quicker.

    1 - 3/36 - 2/36 - 1/36 = 5/6

    if you are wondering where the 3/36 came from, the probability of getting 10 is 3/36, since the ways of getting it are
    5+5, 6+4 or 4+6, and there are 6*6 possible outcomes.

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