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Jun 24, 2013 at 19:03 vote accept Alex R.
Jun 24, 2013 at 19:02 comment added Alex R. Thank you so much for your detailed answer and references!! I realized I fudged the answer and that indeed it should be $1/2(N-2)$.
Jun 24, 2013 at 18:18 history edited Mark Wildon CC BY-SA 3.0
Tidied up references, added final example
Jun 24, 2013 at 16:55 history answered Mark Wildon CC BY-SA 3.0