18~19쪽:12,6,1,4 4 2 36,15,14,4/20~21쪽:2의3승X3의2승X5의2승X7,2의2승X3의2승X5의2승,80,180 3 2의2승X3의2승X5의2승X11,2의3승X3의3승X5X7의2승,252,720 4
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