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The order of the digits in a combination does not matter. So 123 is the same as 132 or 312 etc.

There are 10 combinations using just one of the digits (3 times).

There are 90 combinations using 2 digits (1 once and 1 twice).

There are 120 combinations using three different digit.

220 in all.

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Q: How many 3 digit combinations there 0-9?
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