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when toggle format what by license comment
Oct 12, 2010 at 22:44 comment added mhum Ah. I see. Originally, it seemed that there was a fixed subset of size $m$ that was of interest. Now, it's any $m$-subset.
Oct 12, 2010 at 22:07 comment added JBL This looks right for the question as originally stated, but the restated version is harder.
Oct 12, 2010 at 21:40 history answered mhum CC BY-SA 2.5