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April 19th, 2010, 06:57 AM  #1 
Newbie Joined: May 2009 Posts: 20 Thanks: 0  discrete mathematics
How many strings of 9 digits have each of the digits 1, 3, and 7 appearing at least once?

April 19th, 2010, 08:02 AM  #2 
Senior Member Joined: Oct 2007 From: Chicago Posts: 1,701 Thanks: 3  Re: discrete mathematics
How many don't have all 3 at least once?


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