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Forum URL: http://www.cut-the-knot.org/cgi-bin/dcforum/forumctk.cgi
Forum Name: High school
Topic ID: 149
Message ID: 2
#2, 3 digits on a dollar bill's ID.
Posted by browser on Jun-04-02 at 09:26 AM
In response to message #0
Algorithm:

1.Find the probability of 3 successes out of 8 possibilities in the string.

2.Find the probability that the 3 successes are all different.

3.The product is the probability of 3 different digits appearing on the ID with all other digits different.