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10以內的質數有2 3 5 7 能被2整除則末尾數一定能被2整除 所以個位是2 則組成數位是XX2 又因為此數可被3整除,所以各位數相加為3的倍數 顯然2+3+7=12,可被3整除 所以組成的數可能是372 732
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