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OpenStudy (anonymous):
Area codes for phone numbers are 3 digits long. How many different area codes can be made from the digits 0 through 9 if no digit is used more than once in any single area code? A.27 B.30 C.720 D.1,000
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OpenStudy (anonymous):
C
OpenStudy (anonymous):
use permutations like |dw:1395691945484:dw|
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