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2015 AMC 10B Problem 16

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2015 AMC 10B Problem 16AMC 10 Step by Step
Name:                             Date: September 13, 2026
Basic Probability · difficulty 3 of 5 · about 4 min · position P16-20

Al, Bill, and Cal will each randomly be assigned a whole number from 11 to 1010 , inclusive, with no two of them getting the same number. What is the probability that Al's number will be a whole number multiple of Bill's and Bill's number will be a whole number multiple of Cal's?

  1. A)

    91000\dfrac{9}{1000}

  2. B)

    190\dfrac{1}{90}

  3. C)

    180\dfrac{1}{80}

  4. D)

    172\dfrac{1}{72}

  5. E)

    2121\dfrac{2}{121}

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