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 February 13th, 2010, 12:02 AM #1 Member   Joined: Nov 2006 Posts: 54 Thanks: 0 12-digit number occurrence determination For a 12-digit base ten positive integer N constituted entirely by odd digits, determine the probability that N contains each of the digits 1, 3, 5, 7, 9 at least twice, but at most three times.
 February 13th, 2010, 07:48 AM #2 Senior Member   Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3 Re: 12-digit number occurrence determination Any such number can be rearranged as a string of the form 1133557799xy where x

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