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## kryton1212 2 years ago Two fair dice were rolled once. (a) What is the probability of getting a sum of 7? (b) What is the probability of getting a sum greater than 7? (c) Using (a) and (b), what is the probability of getting a sum less than 7? Delete Cancel Submit

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1. kryton1212
• 2 years ago
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@marigirl

2. AkashdeepDeb
• 2 years ago
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Alrighty! Do you know what a sample space is?

3. kryton1212
• 2 years ago
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no

4. AkashdeepDeb
• 2 years ago
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|dw:1389785917308:dw|

5. AkashdeepDeb
• 2 years ago
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I'll help you solve the second question! If you see, they ask how many are greater than 7. Let's see, 6,2 5,3 4,4 3,5 2,6 6,3 5,4 4,5 3,6 6,4 5,5 4,6 5,6 6,5 6,6 And that is 15 possibilities out of a total 36. So Probability = $$\frac{Possible Outcomes}{Total Outcomes} = \frac{15}{36} = \frac{5}{12}$$ Now I guess you can do the first and the third one similarly! Got it? :D

6. RolyPoly
• 2 years ago
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The third one = 1 - (a) - (b)

7. marigirl
• 2 years ago
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Yes I agree with the ans, kryton1212 does that make sense?

8. kryton1212
• 2 years ago
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thanks all

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