SOLUTION: How many ways are there to write a three digit positive integer using the digits 1 3 7 & 9 if no digit is used more than once
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Question 984712: How many ways are there to write a three digit positive integer using the digits 1 3 7 & 9 if no digit is used more than once Answer by solver91311(24713) (Show Source):
There are 4 ways to choose the first digit. Then, for each of those 4 ways, there are 3 ways to choose the second digit for a total of 12 ways to choose the first two digits. Then there are 2 ways to choose the third digit...
John
My calculator said it, I believe it, that settles it
