AMC 10 Step by Step
Log inSign up
Printable

2009 AMC 10B Problem 11

Include the solutionBack to the problem
2009 AMC 10B Problem 11AMC 10 Step by Step
Name:                             Date: September 13, 2026
Basic Counting · difficulty 2 of 5 · about 2 min · position P11-15

How many 77 -digit palindromes (numbers that read the same backward as forward) can be formed using the digits 22 , 22 , 33 , 33 , 55 , 55 , 55 ?

  1. A)

    66

  2. B)

    1212

  3. C)

    2424

  4. D)

    3636

  5. E)

    4848

Working