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A four-digit number starts with a number between 2-9 in the first position, with no...

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Calculus

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A four-digit number starts with a number between 2-9 in the first position, with no restrictions on the remaining 3 digits.a) Find the probability that a randomly-chosen phone number contains all different digits.b) Find the probability that a randomly-chosen phone number contains at least one repeated digit.

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