The same as the number of twodigit numbers, since the last two digits. must the same as the first two, only reversed. So I'll say there are 100 fourdigit palindromes.
http://wiki.answers.com/Q/How_many_four_digit_pali...

There are 900 three digit palindromes that exist. Thank you for using ChaCha and
http://www.chacha.com/question/howmany3digitpa...

There are 30,240 different 5digit numbers. Math: 10*9*8*7*6. 1st digit has 10 possible choices (09) 2nd digit has 9 possible choices (one of the digits was used in the 1st digit
http://wiki.answers.com/Q/How_many_5_digit_numbers...

You will have 10,000 different combination. Thanks
http://www.chacha.com/question/howmanyfourdigit...
