Posted by john on Friday, March 25, 2011 at 3:27pm.
How many different fourdigit number combinations are possible from the numbers 09?

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 fourdigit 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 52card deck. ...
 Math  How many different threedigit numbers can be written using the digits 4...
 Math. Explain  From the digits 1, 2, 3, and 4, how many positive integers are ...
 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