SOLUTION: to gain access to his account, a customer using an ATM must enter a four-digit code. if repitition of the same four digits are not allowed, how many possible combinations are there

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Question 420132: to gain access to his account, a customer using an ATM must enter a four-digit code. if repitition of the same four digits are not allowed, how many possible combinations are there?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
there are 10,000 numbers from 0000 to 9999

minus the ten with four repeating digits (one for each digit)

leaves 9990 possible combinations