Thread: July 2015
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Old 2015-07-08, 13:49   #10
R. Gerbicz
 
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"Robert Gerbicz"
Oct 2005
Hungary

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It is also important to not forget this condition:
"they need to guess the number on their own head, but they are not allowed to use any number that was previously guessed. "

So they need to guess different number. Note that without this the problem would be easy (and I think that it is well known in mathematics).
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