they would be of the format XYYX
where X varies from 2 to 4
and Y varies from 0 to 9 for each value of X.
for a total of 3 * 10 combinations = 30
starting at 2002
ending at 4994
25
189 palindromes.
48 palindromes.
Forty palindromes.
198 palindromes.
40 palindromes.
There are 90 four-digit palindromes
99 palindromes.
It depends on the font.
There are 900 6-digit palindromes.
99 palindromes.
99 of them.