Question

Area codes are made up of three digit numbers
a. If all numbers can be used for each digit, how many area codes are possible?
will fan and medal

Answer 1

There are 10 possibilities (0123456789) for each digit.
So if pick out two digits, there are ten possibilities for the first
one and ten for the second, for a total of 100. If I ick three digits....

Answer 2

like if I chose 702

Answer 3

Yes, 702 is one choice for a three-digit area code.
Keep following @fwizbang 's logic. If there are 10 choices when there is one digit, and 10x10 choices when there are two digits, there will be _____ choices when there are three digits.