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A computer system uses passwords that consist of five letters followed by a single digit.

(a) How many passwords are possible?

(b) How many passwords consist of three As and two Bs, and end in an even digit?

(c) If you forget your password, but remember that it has the characteristics de-scribed in part (b), what is the probability that you will guess the password correctly on the first attempt?

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Category:- Statistics and Probability
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