You don't mean "3 possible digit combinations"; you mean "3-digit possible combinations"
and you also forgot to specify that the first digit can't be zero.
(We wouldn't have known that, but two of your buddies asked the same question
about 7 hours before you did.)
The question is describing all of the counting numbers from 100 to 999.
That's all of the counting numbers up to 999, except for the first 99.
So there are 900 of them.
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There are 5,040 combinations.
9
Possible 5 digit combinations using 5 digits only 1 time is 5! or 5*4*3*2*1 or 120. Using 5 digits where numbers can be used 5 times is 55 or 3125.
Oh, dude, you want me to list out every possible 4-digit combination using numbers 0 through 9? That's like asking me to count all the grains of sand on a beach! There are 10,000 different combinations, so you might want to grab a snack and get comfy while I rattle them off... or you could just use a combination generator online, but hey, where's the fun in that, right?
Just think of how many possibilities you have for each digit. 10x9x8x7x6x5x4x3x2 or 10 factorial is 3 628 800.