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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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15y ago

What else can I help you with?