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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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