If order doesn't matter, 15 combinations and if order does matter, 360 combinations are possible.
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3 items each in 3 categories gives 3*3*3 = 27 possible combinations.
10,000
If the numbers can be repeated and the numbers are 0-9 then there are 1000 different combinations.
7878
whenever you have a question like this, just multiply the two numbers together and you got your answer.