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2013 AMC 10B Problem 13

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2013 AMC 10B Problem 13AMC 10 Step by Step
Name:                             Date: September 13, 2026
Sequences & Series · difficulty 2 of 5 · about 3 min · position P11-15

Jo and Blair take turns counting from 11 to one more than the last number said by the other person. Jo starts by saying " 11 ", so Blair follows by saying " 1,21, 2 " . Jo then says " 1,2,31, 2, 3 " , and so on. What is the 53rd number said?

  1. A)

    22

  2. B)

    33

  3. C)

    55

  4. D)

    66

  5. E)

    88

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