SOLUTION: What is the probability of getting either a sum of 8 or at least one 6 in the roll of a pair of dice?

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Question 509335: What is the probability of getting either a sum of 8 or at least one 6 in the roll of a pair of dice?
Found 2 solutions by swincher4391, Edwin McCravy:
Answer by swincher4391(1107)   (Show Source): You can put this solution on YOUR website!
How many possibilities are there on two 6 sided dice? 36.
How many possibilities give you at least a 6 on the dice? (1,6;2,6;3,6;4,6;5,6;6,6;6,1;6,2;6,3;6,4;6,5;) 11
How many possibilities give you a sum of 8? (2,6;3,5;4,4;5,3;6,2) 5
P(one 6 or sum of 8) = P(one 6) + P(sum of 8)=11/36 + 5/36 = 18/36 = 1/2 <--- Answer

Answer by Edwin McCravy(20056)   (Show Source): You can put this solution on YOUR website!


The other tutor's answer is incorrect.

I have colored all the ones red that 
either have a sum of 8 or that have 
at least one 6.

⚀⚀   ⚀⚁   ⚀⚂   ⚀⚃   ⚀⚄  ⚀⚅

⚁⚀   ⚁⚁   ⚁⚂   ⚁⚃   ⚁⚄  ⚁⚅

⚂⚀   ⚂⚁   ⚂⚂   ⚂⚃   ⚂⚄  ⚂⚅

⚃⚀   ⚃⚁   ⚃⚂   ⚃⚃   ⚃⚄  ⚃⚅

⚄⚀   ⚄⚁   ⚄⚂   ⚄⚃   ⚄⚄  ⚄⚅

⚅⚀   ⚅⚁   ⚅⚂   ⚅⚃   ⚅⚄  ⚅⚅

Count the red ones.  There are 14 of them.  
Count all the rolls. There are 36 of them.  
So the probability is 14 out of 36 or 
 which reduces to .

Edwin

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