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Assuming a 3-digit number is meant to mean a positive whole number with 3 digits, then no.
Assuming you mean whole numbers and leading zeros do not count, the smallest 3 digit number is 100.
Here's an example. In the number 382, the number 2 is the "unit's digit" (in the "unit's place"), 8 is the "ten's digit" (in the "ten's place"), and 3 is the "hundred's digit."
I am assuming you mean 3-number combinations rather than 3 digit combinations. Otherwise you have to treat 21 as a 2-digit number and equate it to 1-and-2. There are 21C3 combinations = 21*20*19/(3*2*1) = 7980 combinations.
3 digit numbers are lessthan 4 digit numbers