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PUZZLET 106

Selective Deletions


1000 units, numbered 1 to 1000, are examined one at a time, starting with number 1. Every 7th unit is marked (so unit 7 is the first to be marked). Units already marked are skipped over. When the highest unmarked unit is reached, the process continues with the lowest unmarked unit until a point comes when only 1% (ten) of the units remain unmarked. What are their numbers?  Table
 


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Last Updated: January 13th, 2010.