SOLUTION: How many and what 4 digit combinations can I make from 0 1 8 9

Question 1013363: How many and what 4 digit combinations can I make from 0 1 8 9
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
There are 256 combinations, 4^4.
You can start with 0000 then 0111 or 0888 or 0999.
You have 4 ways to choose the first and second and third and fourth.
If each digit must be used, then there are 4 ways to choose the first, 3 the second, 2 the third, and 1 the fourth, or 24 such combinations.
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