Mikepd10 Mikepd10
  • 09-12-2015
  • Mathematics
contestada

How many 4-digit palindromes contain both the digits 1 and 2

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hoc hoc
  • 09-12-2015
4 digit palindromes must be of form abba, so being required that you use both numbers, you only have two: 1221 and 2112
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