A four-character password consists of one letter of the alph
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A four-character password consists of one letter of the alphabet and three different digits between 0 and 9,inclusive.The letter must appear as the second or third character of the password.How many different passwords are possible?
答案是37440?
答案是37440?
对
A(下标10上标3)*26*2=37440
A代表:10个数字(0-9)被随便排在除了字母那位剩下的三位中
26代表:字母的可能性(一共26个字母)
2代表:两种可能性——字母可出现在第二位/第三位上
A(下标10上标3)*26*2=37440
A代表:10个数字(0-9)被随便排在除了字母那位剩下的三位中
26代表:字母的可能性(一共26个字母)
2代表:两种可能性——字母可出现在第二位/第三位上
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