algebra

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A palindrome is a number that reads the same forwards as it does backwards. For example, 98789 is a 5-digit palindrome, and 7337 is a 4-digit palindrome. How many 3-digit palindromes are there?

  • algebra -

    Assuming that we can't start with 0 , or else it would be a 2 - digit number,
    there are 9 choices for the 1st, then only 1 at the end
    the middle can be any of the 10

    number of such numbers
    = 9 x 10 x 1 = 90

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