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Internet Message Format  |  1992-09-15  |  618 b 
  1. Path: sparky!uunet!elroy.jpl.nasa.gov!ames!pasteur!dog.ee.lbl.gov!network.ucsd.edu!mvb.saic.com!cpva!inlowm
  2. From: inlowm@cpva.saic.com
  3. Newsgroups: sci.math.stat
  4. Subject: two pairs
  5. Message-ID: <11950.2ab624d8@cpva.saic.com>
  6. Date: 15 Sep 92 18:00:55 PST
  7. Organization: Science Applications Int'l Corp./San Diego
  8. Lines: 10
  9.  
  10. The problem is that you introduced ordering by first choosing what your
  11. first pair would be then by choosing what your second pair would be.
  12. By counting ordered pairs you have effectively double the numerator.
  13. Try this as your numerator:
  14.  
  15.   (13C2)*(4C2)*(4*11)
  16.  
  17. Mark Inlow
  18. inlowm@jupiter.saic.com
  19.  
  20.