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1)每位上的数位可以從10個數位中任選,囙此可組成六比特號碼數=10^6=1000000個;2)由於六位數的最高位(十萬比特)不能是0,囙此可組成六位數=9×10^5=900000個;3)由於數位無重複,囙此前面用過的數後面不能再用…
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