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March 24, 2017

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What is the probability of the sum of two fair dice equals a prime number when rolled once?

  • Probability - ,

    So we are looking for a sum of
    2,3,5,7,or 11
    number of ways for 2 is 1
    number of ways for 3 is 2
    number of ways for 5 is 4
    number of ways for 7 is 6
    number of ways for 11 is 2

    so prob for a prime = (1+2+4+6+2)/36 = 5/12

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