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Jan 23, 2012 at 21:06 vote accept Izhar Oppenheim
Jan 23, 2012 at 21:06 comment added Izhar Oppenheim thanks. In the first example I was refering to cases where $k< n-1$ (I forgot to say that - my bad), but your second example does the trick.
Jan 23, 2012 at 15:28 history answered David E Speyer CC BY-SA 3.0