Probability

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A pair of dice is rolled, one black and one white. Find the probability of each of the following events.

1. The total is between 3 and 7.
My answer: 1/3
2. The total is 13.
My answer: 0
3. The numbers are 2 and 5.
?????????
4. The black die has 2 and the white die has 5.
??????
5. The black die has 2 or the white die has 5.
??????

  • Probability -

    #1: I get 20/36 = 5/9
    B:1 & W:2,3,4,5,6
    B:2 & W:1,2,3,4,5
    B:3 & W:1,2,3,4
    B:4 & W:1,2,3
    B:5 & W:1,2
    B:6 & W:1

    #2 ok

    #3: 2/36 = 1/18
    B:2 & W:5
    B:5 & W:2

    #4: 1/6 * 1/6 = 1/36
    #5: 1/6 + 1/6 = 1/3
    You can list all 12 events if you want

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