Scott208 Scott208

15-02-2017
Mathematics

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A palindrome is a positive integer which reads the same forward and backward, like 12321 or 4884

How many 4-digit palindromes are there?

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LammettHash LammettHash

15-02-2017

The first digit can be any numeral 1-9, while the second digit can be any of 0-9, so there are [tex]9\times10=90[/tex] such numbers. The third and fourth digits will mirror the second and third, respectively, so you only need to account for the first two digits.

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