Question 98312: How many four-digit numberal codes can be created if no digit may be repeted?
Thank you in advance for your assistance. Answer by 303795(602) (Show Source):
You can put this solution on YOUR website! There are 10 ways to choose the first digit.
9 ways to choose the second because the tenth digit is used in the first position.
8 ways to choose the third (the other two are used in positions 1 and 2) and 7 ways to choose the fourth digit (the other three have already been used).
This is a total of 10 x 9 x 8 x 7 = 5040 combinations
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