A telephone number consists of seven digits. The first three representing the exchange. How many different telephone numbers are possible within the 537 exchange?

in this case repetition of numbers is possible.

So, How can I do this?

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- April 16th 2007, 10:37 AMAmyDifferent number of numbers
A telephone number consists of seven digits. The first three representing the exchange. How many different telephone numbers are possible within the 537 exchange?

in this case repetition of numbers is possible.

So, How can I do this? - April 16th 2007, 11:03 AMSoroban
Hello, Amy!

Quote:

A telephone number consists of seven digits.

The first three representing the exchange.

How many different telephone numbers are possible within the 537 exchange?

In this case repetition of numbers is possible.

So, How can I do this?

*Thinking.*

How many 4-digit combinations are possible?

Well, they range from 0000 to 9999, right?

That makes a total of . . . um . . .

- April 16th 2007, 07:35 PMCaptainBlack
- April 17th 2007, 12:38 PMAmy
**How 0000+9999=9999 :confused:**

I thought it was 10*10*10*10=10000 - April 17th 2007, 12:40 PMCaptainBlack