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因2006不能被3整除,2000到2009不存在這樣的數.考慮数字0到1999這2000個數,不足4位的在前面補足0.即:0000、0001、0002……、19996不可能出現在首位,首位0開頭的1000個數,1開頭的1000個數.分情況討論:一、0開頭時:6...
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