2 Elsa is creating a new FB account, and doesn't know what to make h password. She decides to generate a 14-character password by sele independently and uniformly at random from {a, b, ..., z} U {A, B, . Characters can be repeated. (a) What is the probability that exactly 7 of the characters are dig (b) What is the expected number of digits in the password? (c) What is the variance of the number of digits in the password?

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