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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? 27 30 720 1,000
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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? 27 30 720 1,000

User Monofal
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For the first digit there are 10 options. For the second digit, the number used in the first digit can not be reused leaving 9 options. The third digit had 8 options.

10*9*8=720
User MotherDawg
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