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Apr 17, 2013 at 19:40 comment added user32372 There's also a reference on the wikipedia page. calpoly.edu/~kmorriso/Research/RandomWalks.pdf The proof is on page 4.
Apr 17, 2013 at 19:11 comment added Mark Can you kindly give a reference for the proof?
Apr 17, 2013 at 18:17 vote accept Mark
Apr 17, 2013 at 18:15 history answered user32372 CC BY-SA 3.0