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17-08-2018
Mathematics

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What is the probability of rolling the sum of 5 or 8 on a pair of number cubes?

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konrad509 konrad509

17-08-2018

[tex] |\Omega|=6^2=36\\|A|=\underbrace{4}_{\text{the sum is 5}}+\underbrace{5}_{\text{the sum is 8}}=9\\\\P(A)=\dfrac{9}{36}=\dfrac{1}{4}=25\% [/tex]

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yartinal yartinal

17-08-2018

The probability of rolling a 5 is 4/36 (reduced to 1/9) and the probability of rolling an eight is 5/36. Rolling either would be 9/36 (reduced to 1/4)

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