Question:
A four-digit number starts with a number between 2-9 in the
Last updated: 8/10/2022
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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.