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2022 AMC 10B Problem 15

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2022 AMC 10B Problem 15AMC 10 Step by Step
Name:                             Date: September 13, 2026
Sequences & Series · difficulty 3 of 5 · about 3 min · position P11-15

Let SnS_n be the sum of the first nn terms of an arithmetic sequence that has a common difference of 22 . The quotient S3nSn\frac{S_{3n}}{S_n} does not depend on nn . What is S20S_{20} ?

  1. A)

    340340

  2. B)

    360360

  3. C)

    380380

  4. D)

    400400

  5. E)

    420420

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