Question

In the state of Georgia, telephone numbers consists of 10 digits, including the area code. One of these area codes is 770. The first digit following the area code cannot be 1 or 0. Find the number of possibilities for telephone numbers in area code 770. How many different telephone numbers in this area code are possible if only even digits are used? show your work.

Answer 1

P(n) = 8 * 10^6 = ?

P(even) = 4^7 = ?