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2007 AMC 10B Problem 20

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2007 AMC 10B Problem 20AMC 10 Step by Step
Name:                             Date: September 13, 2026
Basic Counting · difficulty 3 of 5 · about 3 min · position P16-20

A set of 2525 square blocks is arranged into a 5×55 \times 5 square. How many different combinations of 33 blocks can be selected from that set so that no two are in the same row or column?

  1. A)

    100100

  2. B)

    125125

  3. C)

    600600

  4. D)

    23002300

  5. E)

    36003600

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