# algebra

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A number cube is rolled three times. What is the probability of rolling a 5 at least once?

• algebra -

Getting "a 5 at least once" = one, two or three 5s.

Once = 1/6(5/6)(5/6) = ?
Twice = 1/6(1/6)(5/6) = ?
Three times = 1/6^3 = ?

Either-or probabilities are found by adding individual probabilities.

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