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Dec 1, 2016 at 3:42 vote accept T. Amdeberhan
Sep 24, 2016 at 20:03 comment added T. Amdeberhan Although I gave the case $n=3$ in the question, I already had that generalization and a similar one for the one with denominator $x+y+z$.
Sep 24, 2016 at 18:35 history edited Ofir Gorodetsky CC BY-SA 3.0
fixed a typo, added a generalization.
Sep 24, 2016 at 10:39 history edited Ofir Gorodetsky CC BY-SA 3.0
fixed some mistakes, simplified the argument slightly.
Sep 24, 2016 at 10:33 history edited Ofir Gorodetsky CC BY-SA 3.0
fixed some mistakes.
Sep 24, 2016 at 9:43 history edited Ofir Gorodetsky CC BY-SA 3.0
added 176 characters in body
Sep 24, 2016 at 9:37 history answered Ofir Gorodetsky CC BY-SA 3.0