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A computer system uses passwords that contain exactly 5 characters, and each character is 1 of...

A computer system uses passwords that contain exactly 5 characters, and each character is 1 of the 26 lowercase letters (a–z) or 26 uppercase letters (A–Z) or 10 integers (0–9). Let Ω denote the set of all possible passwords, and let A and B denote the events that consist of passwords with only letters or only integers, respectively. Determine the probability that a password contains at least 1 uppercase letter given that it contains only letters.

The answer is not 0.975

Math   Statistics-And-Probability   
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