destiny8749 destiny8749

23-07-2017
Mathematics

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You pick 3 digits (0-9) at random without replacement, and write them in the order picked. what is the probability that you have written the first 3 digits of your phone number? assume there are no repeats of digits in your phone number.

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sergibcnusa sergibcnusa

23-07-2017

There are 10*9*8 = 720 possibilities and only one case that would be the 3 digits of the phone number:

P = 1/720

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