One: 1001
A palindrome reads the same forwards and backwards. Therefore for a 4 digit number:
Starting with 1000, the first palindrome will be 1001, then 1111, 1221, 1331, ...
As it must be less than 1100, there is only one, 1001.
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ther are 99 palindromes in between 1 and 1000.
99 palindromes.
99 palindromes.
90 palindromes.
109