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是星期五. 365^15 =365*365*365*……*365(15個365) =(364+1)^15 =(364+1)^14*364+(364+1)^14 (364+1)^14*364是能整除7的,因為364能整除7, 所以剩下(364+1)^14 相同反復操作,最後就是餘數為1. 所以星期五.
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