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Mathematics 12 Online
OpenStudy (anonymous):

Im in need of some help with this and the process behind it! Someone you really want to go out with gave you a beeper number. You didn't write it down and remember only the area code, the exchange (the first three digits of the number), and the fact that the last four digits contain a 4. How many different such numbers are there? What is the probability of your randomly picking the right number?

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