The same as the number of two-digit numbers, since the last two digits
must the same as the first two, only reversed.
So I'll say there are 100 four-digit palindromes.
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There are 900000 of them.
The same as the number of two-digit numbers, since the last two digits must the same as the first two, only reversed. So I'll say there are 100 four-digit palindromes.
899100 of them. Only 900 of the 900000 are palindromic.