SOLUTION: if five men A,B,C,D,E speak at a meeting ,in how many ways can they do so without B speaking before A?

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Question 934506: if five men A,B,C,D,E speak at a meeting ,in how many ways can they do so without B speaking before A?
Answer by AnlytcPhil(1806) About Me  (Show Source):
You can put this solution on YOUR website!
There are 5! orders they can speak in with no restrictions.  In exactly half of
those 5! ways, A speaks before B and half of those 5! B speaks before A.

Answer: expr%281%2F2%29%2A5%21=expr%281%2F2%29%2A120=60+ways

Edwin