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Topic: Permutation problems
Replies: 13   Last Post: Aug 12, 2013 2:23 PM

 Messages: [ Previous | Next ]
 Mahesh Posts: 5 From: India Registered: 3/2/12
Re: RE: Permutation problems
Posted: May 19, 2012 2:35 AM

I could make some progress after your reply. I thought of doing it other way round. So now the sets are:
A: Contain fish |A|=23!
B: Contain rat |B|=24!
C: Contain bird |C|=23!
A n B: 21!
A n C: 20!
B n C: 21!
A n B n C: 18!

A' n B' n C'= Total permutations - (A u B u C)
= 26!-(23! + 24! + 23! - 21! - 20! - 21! +18!)
=4.0261.... * 10 ^ 26
Let me know if this is correct.
Thank you.

Date Subject Author
5/18/12 Mahesh
5/18/12 Ben Brink
5/19/12 Mahesh
5/19/12 Ben Brink
5/19/12 Angela Richardson
5/19/12 Ben Brink
5/20/12 Peter Scales
5/22/12 Ben Brink
8/11/13 Mark Rickert
8/11/13 Ben Brink
8/12/13 Mark Rickert
8/12/13 Ben Brink
8/12/13 Peter Scales
8/12/13 Ben Brink