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Using the word "combinations" in the English sense (as opposed to mathematical sense the expert has used) where it often used in the mathematical sense of the word "permutations":

Assuming the hundreds digit must be at least 1 (eg 99 = 099 is not considered a three digit number), then:

9 x 10 x 10 = 900.

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โˆ™ 2014-12-12 08:45:03
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โˆ™ 2014-10-01 18:39:59

There are 220 combinations.10 where all three digits are the same,90 where two of the digits are the same and 1 is different, and120 where all three digits are different.

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Q: How many different 3 digit combinations can be made using 0 thru 9 and they can repeat?
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