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Nov 6, 2013 at 21:11 comment added Douglas Zare @Bill Johnson: If you feel this question is too elementary, despite the fact that a similar question was asked before and had 4 upvotes and an answer, then maybe you should vote to close, or state explicitly in your comment that you think this is too easy to answer.
Nov 6, 2013 at 20:43 comment added Bill Johnson It wasn't a HW problem, Wlodek--Alex is a grad student at Courant and I am at Texas A&M.
Nov 6, 2013 at 20:25 comment added Bill Johnson Hey, guys; Alex is a student and was supposed to work this out for himself.
Nov 6, 2013 at 20:14 history answered Douglas Zare CC BY-SA 3.0