How many strings of four hexadecimal digits have at least


Question: a. How many strings of four hexadecimal digits do not have any repeated digits?

b. How many strings of four hexadecimal digits have at least one repeated digit?

c. What is the probability that a randomly chosen string of four hexadecimal digits has at least one repeated digit?

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Mathematics: How many strings of four hexadecimal digits have at least
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