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Mathematics, 10.04.2020 23:12 NoireDemon
How many possible seven-digit phone numbers are there? You must draw boxes
B. How many seven digit numbers are there that begin with the prefix 772?
C. How many seven digit numbers are there that begin with the prefix 772 and none of the last four digits repeat?
D. What is the probability that a randomly selected phone number with the prefix 772 has none of its last four digits repeating?
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How many possible seven-digit phone numbers are there? You must draw boxes
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