(a) How many strings of six hexadecimal digits do not have any repeated digits? 11440640 (b) How many strings of six hexadecimal digits have at least one repeated digit? 5336576 X (c) What is the probability that a randomly chosen string of six hexadecimal digits has at least one repeated digit? (Round your answer to the nearest tenth of a percent.) 31.9 % Need Help? Read It

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