AMC 10 Step by Step
2017 AMC 10AProblem 25P21-25~12 minPrint

How many integers between 100100 and 999999 , inclusive, have the property that some permutation of its digits is a multiple of 1111 between 100100 and 999?999? For example, both 121121 and 211211 have this property.

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.