how many possible telephone numbers are there when there are seven digits the first two of which between 2 and 9 inclusive the third digit between 1 and 9 inclusive and each of the remaining may be between 0 and 9 inclusive ?
The Answer to the Question
is below this banner.
Here's the Solution to this Question
There are 8 possabilities for each of the first two numbers, 9 possabilities for the third number and 10 possabilities for each of the remaining four numbers. So, there are totally