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Unformatted text preview: up, 25 goes Down Up Down. 25 ends down. NonPerfect square numbers are flipped an even amount of times. Thus it will end the same way it started. (They started up, now they are down) For example, the number 45: Divisible by 1,3,5,9,15,45. Since the problem starts the cards up, 45 goes Down Up Down Up Down Up. 45 ends up. All Perfectly squared numbers are down, while the rest of the numbers are up....
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This note was uploaded on 10/20/2010 for the course MATH 051 taught by Professor Moses during the Fall '07 term at GWU.
 Fall '07
 Moses
 Math

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