Saturday, January 2, 2010

How many 4 digits codes are possible using the numbers 0 -9 only once?

The codes
have to be prepared using the numbers 0-9 and are 4 digit long. Also, each of the numbers can be
used only once

We have 10 choices for the first digit.

As
there are no repetitions, there are 9 choices for the second digit, 8 choices for the third
digit and 7 choices for the fourth digit.

In all, the number of codes that
can be created are 10*9*8*7 = 5040

The number of 4 digit codes
possible using the numbers 0-9 only once is 5040.

No comments:

Post a Comment

How is Joe McCarthy related to the play The Crucible?

When we read its important to know about Senator Joseph McCarthy. Even though he is not a character in the play, his role in histor...