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Mathematics 9 Online
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?

OpenStudy (anonymous):

8C1*2C1*9C1

OpenStudy (anonymous):

the answer is 160

OpenStudy (anonymous):

maybe

OpenStudy (anonymous):

how can i solve?

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