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Roll three fair dice. What is the probability that the sum of the numbers is at most 6?

 Sep 15, 2016
 #1
avatar+37084 
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I'm going to make a guess

216 possible rolls

8 rolls possible less than or = 6

8/216 = 1/27    ?                  

 

Correct?   Anyone?

 Sep 15, 2016
 #2
avatar+129840 
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Probabilty that a "3"  is rolled = 1/216

 

Probabilty that a "4" is rolled = 3/216

 

Probability that a "5"  is rolled =  6/216

 

Probability that a "6"  is rolled =  10/216       

 

Sum of the above probabilities =  20 / 216 =    5 / 54

 

 

cool cool cool

 Sep 15, 2016
 #3
avatar+37084 
0

Ooops.......   forgot to add in the 5's and 6's properly !     Thanx  Chris !  

ElectricPavlov  Sep 16, 2016

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