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  • 13-02-2015
  • Mathematics
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The only two-digit prime with each digit the same

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apologiabiology
apologiabiology apologiabiology
  • 13-02-2015
there is only one because any 2 digit number with the same digits, would be a multiple of 11
because the 2 digit numbers that have the same digits are all multiplues of 11
the numbers are 11,22,33,44,55,66,77,88,99
and 11 is prime so the answer is 11
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