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OpenStudy (anonymous):
a 4 digit house number contains no zeros. the number has exactly three distinct digits. how many such numbers are there?
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OpenStudy (anonymous):
So there are 9 possible digits for the house number, 3 of which are unique. That means that for the first digit there are 9 combinations. For the second there are 8 (as it can't be the same as the first). For the third there are 7 (as it can't be the same as the first or second). For the fourth, there are 9 as only 3 digits are distinct. Total number = 9*8*7*9 = 4536
OpenStudy (anonymous):
okay, got it, thanks!
OpenStudy (anonymous):
No problem!
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