they would be of the format XYX
where X varies from 1 to 9
and Y varies from 0 to 9 for each value of X.
for a total of 9 * 10 combinations = 90
*This Assumes that you wanted to include 999 as one of your answers How ever it could be argued (correctly) that it is not between 100 and 999*
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There is: 101,111,121,131,141,151,161,171,181,191 202,212,222,etc... 999 There are 90 palindromic 3 digit numbers
1001, 1111
180
it too long but its between 100 000 and 999 999 examples: 124 132 556 318 582 782 123 126 436 419 665 876 258 965 875 785 256 487 756 356
A three digit figure is any number with a value between 100 and 999 and (-100) and (-999).