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How to solve this problem?
John wrote a phone number on a note that was later lost. John can remember that the number had 7 digits, the digit "1" appeared in the last three places and "0" did not appear at all. What is the probability that the phone number contains at least two prime digits?
a) 15/16 b) 11/16 c) 11/12 d) 1/2 e) 5/8
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