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

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

User Robert Pal
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4 digit palindromes must be of form abba, so being required that you use both numbers, you only have two: 1221 and 2112
User Clayton Hughes
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