It's Okay to be Different
Probability
Level
2
How many 3-digit integers have three distinct digits?
The answer is 648.
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1 solution
{1, 2, 3, 4, 5, 6, 7, 8, 9} for hundreds place. {1, 2, 3, 4, 5, 6, 7, 8, 9, 0} minus digit used for tens place. {1, 2, 3, 4, 5, 6, 7, 8, 9, 0} minus two digits for ones place.
9 * 9 * 8 = 648