Question

In a different plan for area​ codes, the first digit could be any number from 0 through 6​, the second digit was either 6 or 7​, and the third digit could be any number except 0. With this​ plan, how many different area codes are​ possible?

Answer 1

126

Explanation:

The number of possible codes is the product of the number of possibilities for each digit of the code:

7 × 2 × 9 = 126

The plan allows for 126 possible area codes.