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2010 AMC 10B Problem 23

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2010 AMC 10B Problem 23AMC 10 Step by Step
Name:                             Date: September 13, 2026
Arrangements with Restrictions · difficulty 4 of 5 · about 8 min · position P21-25

The entries in a 3×33 \times 3 array include all the digits from 11 through 99 , arranged so that the entries in every row and column are in increasing order. How many such arrays are there?

  1. A)

    1818

  2. B)

    2424

  3. C)

    3636

  4. D)

    4242

  5. E)

    6060

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