Probability on randomly selected phone number

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The first three digits of a university telphone exchange are 452. if all the sequences of the remaining four digits are equally likely, what is the probability that a randomly selected universtiy phone number contains seven distinct digits?

Reference no: EM1390374

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Probability on randomly selected phone number : The first three digits of a university telphone exchange are 452. if all the sequences of the remaining four digits are equally likely, what is the probability that a randomly selected universtiy phone number contains seven distinct digits?

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