# Thread: Different number of numbers

1. ## Different 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?

2. Hello, Amy!

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?
Instead of waiting for Divine Inspiration, try Thinking.

How many 4-digit combinations are possible?

Well, they range from 0000 to 9999, right?

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

3. Originally Posted by Soroban
Hello, Amy!

Instead of waiting for Divine Inspiration, try Thinking.

How many 4-digit combinations are possible?

Well, they range from 0000 to 9999, right?

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

0000 + 9999 = 9999

RonL

4. How 0000+9999=9999

I thought it was 10*10*10*10=10000

5. Originally Posted by Amy
How 0000+9999=9999

I thought it was 10*10*10*10=10000
Its a joke. Range from 0000 to 9999 makes a total - see a sort of joke.

RonL