Posted by **john** on Friday, March 25, 2011 at 3:27pm.

How many different four-digit number combinations are possible from the numbers 0-9?

- math -
**Reiny**, Friday, March 25, 2011 at 5:07pm
number of different 4 digit number

= 9x10x10x10 = 9000

(we cannot start with a zero, thus only 9 choices for the lead number)

- math -
**Reiny**, Friday, March 25, 2011 at 5:09pm
In my answer, I assumed that you can repeat a number

If each can be used only once, then

number of ways = 9x9x8x7 or 4536

## Answer this Question

## Related Questions

- math - A four-digit number between 12 and 13 has an odd number in the hundredths...
- Math - Take a four digit number (abcd) and repeat it to make an eight digit ...
- Math - Take a four digit number (abcd) and repeat it to make an eight digit ...
- math - Answer the following questions below that go with the following: Let's ...
- COMBINATION!!MATH!!!hurryyy!!! - Cards are drawn at random from a 52-card deck. ...
- Math. Explain - From the digits 1, 2, 3, and 4, how many positive integers are ...
- Math - How many different three-digit numbers can be written using the digits 4...
- decimals - ` a four digit number between 12 and 13 has an odd number in the ...
- decimals - a number has four digits. the digit in the hundredth place is greater...
- Math (Reiny) - Regarding my question below, when the question talks about digits...

More Related Questions