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OpenStudy (anonymous):
Before 1995, three-digit area codes for the united states had the following restrictions: (a) neither 0 nor 1 could be used as the first digit. (b) 0 or 1 had to be used for the second digit. (c) there were no restrictions on the third digit. How many different area codes were possible?
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OpenStudy (anonymous):
8C1*2C1*9C1
OpenStudy (anonymous):
the answer is 160
OpenStudy (anonymous):
maybe
OpenStudy (anonymous):
how can i solve?
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