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To be a 3 digit palindromic number, it must be of the form aba.

I assume that a 3 digit number must be at least 100 (so that 020 for example does not count as a 3 digit number):

  • a can be any of the nine digits 1-9;
  • for each of these b can be any of the ten digits 0-9

Thus there are 9 x 10 = 90 three digit palindromic numbers.

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โˆ™ 2011-04-04 14:54:36
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Q: How many 3-digit palindromic numbers are there?
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