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November 21, 2014

November 21, 2014

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

- math -
**Reiny**, Friday, March 25, 2011 at 5:07pmnumber 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 5:09pmIn my answer, I assumed that you can repeat a number

If each can be used only once, then

number of ways = 9x9x8x7 or 4536

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