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如果能被9整除,那麼這三位數個位、十比特、百位的數位和必須能被9整除,這樣的組合可能是由1、2、6中三個數位或1、3、5中的三個數位或2、3、4中三個數位組成的三位數,這樣一共有6+6+6=18種.故選B.
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