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If you roll a die two times, what is the probability that the sum will be more than 9? Show your work.

User Yeggeps
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1 Answer

7 votes

Answer:

1/6

Explanation:

Total sum if the first roll is 1:

1 + 1 = 2

1 + 2 = 3

1 + 3 = 4

1 + 4 = 5

1 + 5 = 6

1 + 6 = 7

Total sum if the first roll is 2:

2 + 1 = 3

2 + 2 = 4

2 + 3 = 5

2 + 4 = 6

2 + 5 = 7

2 + 6 = 8

Total sum if the first roll is 3:

3 + 1 = 4

3 + 2 = 5

3 + 3 = 6

3 + 4 = 7

3 + 5 = 8

3 + 6 = 9

Total sum if the first roll if 4:

4 + 1 = 5

4 + 2 = 6

4 + 3 = 7

4 + 4 = 8

4 + 5 = 9

4 + 6 = 10

Total sum if the first roll is 5:

5 + 1 = 6

5 + 2 = 7

5 + 3 = 8

5 + 4 = 9

5 + 5 = 10

5 + 6 = 11

Total sum if the first roll is 6:

6 + 1 = 7

6 + 2 = 8

6 + 3 = 9

6 + 4 = 10

6 + 5 = 11

6 + 6 = 12

If we look at all the possible rolls we get from two dice, we see that there are 36 different possibilities. Out of all of these, only 6 rolls produce a total greater than 9. [Note: I did not include the possibility of rolling a 9 or greater, but the possibility of rolling greater than 9.] So, the possibility of rolling two dice and getting a sum greater than 9 is 6/36, or 1/6.

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User Sam Logan
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