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String of hexadecimal digits do not have any repeated digits

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Reference no: EM131573481

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?

Reference no: EM131573481

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