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Aug 10, 2011 at 12:07 comment added Mark Wildon I like the argument for the lower bound, but I suspect that some restriction on $k$ is needed. For instance, if $k$ is of the order $\sqrt{n}$ then, by the Birthday Paradox, it will be likely that two of the $a_j$ are equal. Then the error introduced by discarding sequences with repeated elements will be appreciable.
Aug 9, 2011 at 17:36 history edited Rob CC BY-SA 3.0
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Aug 9, 2011 at 17:29 history answered Rob CC BY-SA 3.0