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Old 07-27-2007   #5
Armadura
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36 combinations,6 are equal to seven and 2 are equal to eleven.Odds of getting seven or eleven are: 8/36=2/9Odds of not getting a seven or eleven are: 7/9The number of seven or eleven is a Binomial with n=10 and p=2/9 thenP(X=5)=10C5(2/9)^5(7/9)^510C5=(10*9*8*7*6*5!)/(5!*(10-5)!)=10*9*8*7*6/(5*4*3*2)=2*3*2*7*3=252P(X=5)=252*(32/59049)*(3125/59049)=0.007227289