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Old 2021-02-13, 19:53   #3
Batalov
 
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Mar 2008
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This reminds me of the George PĆ³lya book How to Solve It.
Everyone could do very well by reading it. (Some time in their life, I mean.)
Nick's suggestion fits the patterns Work backward, Eliminate possibilities, Consider special cases (or something like that, I am shooting from the hip).
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