The password will have 4 characters, which means we only have 1 letter per character without repeats You have 5 possible letters to choose from for the first slot. Asked • 09/30/18 how many different four letter code words can be formed using the letters a, b, c, and d? A passcode for a certain security system consists of 2 letters, followed by 4 digits If neither the letters or digits are allowed to repeat, how many different passcodes are possible? How many different five letter passwords can be formed from the lettersa,b,c,d,e,f,g and h if no religion of letters is allowed
Answer by stanbon (75887) (show source): Answer by ikleyn (52736) (show source): If three letters are followed by two digits sounds like a permutation, not combination That is, passwords like aab110 and aba101 are both allowed (with duplicate letters/numbers) and are different from each other (even though they contain the same letters and the same numbers).
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