Answer :
Number of possible area codes = 144
The telephone area codes consist 3 digits.
The possible digits are 1, 2, 3,4,5,6,7,8,9,0. That is, a total of 10 digits.
The first digit was not 0 or 1. So the remaining are 2,3,4,5,6,7,8,9. There are 8 possibilities in first place.
The second digit is either 0 or 1. So there are only two possibilities for second place.
The third digit was anything except 0. So the third digit has 9 possibilities.
The total possibilities of the three digit number is the product of possibilities of digits in each place.
Hence, Number of possible area codes = 8 x 2 x 9 = 144
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