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2021 AMC 10B Problem 18

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2021 AMC 10B Problem 18AMC 10 Step by Step
Name:                             Date: September 13, 2026
Basic Probability · difficulty 3 of 5 · about 4 min · position P16-20

A fair 66 -sided die is repeatedly rolled until an odd number appears. What is the probability that every even number appears at least once before the first occurrence of an odd number?

  1. A)

    1120\frac{1}{120}

  2. B)

    132\frac{1}{32}

  3. C)

    120\frac{1}{20}

  4. D)

    320\frac{3}{20}

  5. E)

    16\frac{1}{6}

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