SOLUTION: in a company, ID cards have 5 digit numbers. a. can be formed if repetition of the digit is allow? b. how many ID cards can be formed if repetition of the digit is not allowed.

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Question 894059: in a company, ID cards have 5 digit numbers.
a. can be formed if repetition of the digit is allow?
b. how many ID cards can be formed if repetition of the digit is not allowed.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
With repetition,
N=10%2A10%2A10%2A10%2A10=10%5E5=100000
Without repetition,
N=10%2A9%2A8%2A7%2A6=30240