SOLUTION: How would I do this kind of problem A telephone number consists of seven digits, the first three representing the exchange. How many different telephone numbers are possible wi

Question 43528: How would I do this kind of problem
A telephone number consists of seven digits, the first three representing the exchange. How many different telephone numbers are possible within the 537 exchange?
Answer by Nate(3500) (Show Source): You can put this solution on YOUR website!
Depends, can you repeat digits?
If you can ....
5 - 3 - 7
Three numbers:
3 * 3 * 3 = 27 different possibilites
3 * 3 * 3 * 9 * 9 * 9 * 9 = 177,147
If you can not ....
3 * 2 * 1 = 6 different possibilites
3 * 2 * 1 * 7 * 6 * 5 * 4 = 5,040
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