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10

 

You can only have one choice, the number 4 as the hundred digit and also one choice, the number 5 as the units digit. However, you can have any integer from 0-9 as the hundreds digit.

The number of combinations is thus 1 x 10 x 1 = 10.

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Q: How many three-digit numbers have the hundreds digit equal to 4 and the units digit equal to 5?
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