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March 30, 2017

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A six-sided die (with numbers 1 through 6) and an eight-sided die (with numbers 1 through 8) are rolled. What is the probability that there is exactly one 6 showing? Express your answer as a common fraction.

  • math - ,

    For all probabilities, multiply individual probabilities. For either-or probabilities, add.

    (1/6 * 7/8) + (5/6 * 1/8) = ?

  • math - ,

    2/5

  • math - ,

    1/4

  • math - ,

    There are 2 cases: the 6 is rolled either on the 6 or 8 sided die. Therefore, we have ((1/6)(7/8))+((5/6)(1/8))=1/4.

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