Precalculus

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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.
??????

  • Precalculus -

    Make block matrix 6 by 6 for total of 36 possible outcomes. Then count how many satisfy your criteria.

    1. I get 20/36 = 5/9

    2. agree

    3. 2/36 = 1/18

    4. 1/6 * 1/6 = 1/36

    5. 1/6 + 1/6 = 1/3

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