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Two 6-sided dice are rolled. Find the odds of rolling s sum that is a prime number

Question ID
524944

Created
April 4, 2011 12:01am UTC

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URL
https://questions.llc/questions/524944

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449

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  1. Possible prime sums are 2,3,5,7, and 11
    number of ways to get 2 = 1
    numbr of ways to get 3 = 2
    number of ways to get 5 = 4
    number of ways to get 7 = 6
    number of ways to get 11 = 2
    total = 15

    prob of that happening = 15/36 = 5/12
    so prob of that NOT happening = 1-5/12 = 7/12

    odds in favour of a sum which is prime = (5/12) : (7/12)
    = 5 : 7

    Answer ID
    525012

    Created
    April 4, 2011 1:14am UTC

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