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Re: Permutation problems
Posted:
Aug 12, 2013 1:35 PM


Hi Mark,
> The same fish/rat logic (inclusion/exclusion) needs > to be applied to the second problem as well. For > example, 9876450123 has been counted three times. > I believe the solution is: > 7!+8!+7!  (5!+4!+5!) + 2!
Thanks for picking up that double and triple counting. I agree with your result.
Peter Scales.



