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May 3, 2014 at 20:32 vote accept Felix Goldberg
May 2, 2014 at 22:40 history edited Robert Bryant CC BY-SA 3.0
Added a calculation in the general case when n=2.
May 2, 2014 at 12:19 history edited Robert Bryant CC BY-SA 3.0
Put in the obvious explanation that doesn't use calculation
May 2, 2014 at 12:02 history edited Robert Bryant CC BY-SA 3.0
Added the details of the calculation.
May 2, 2014 at 11:44 history answered Robert Bryant CC BY-SA 3.0