SOLUTION: A password must contain 4 digits from 0-9 and the digits must not be repeated. How many combinations are possible? Is the answer 10X9X7X8= 5040? What if its a 4 digit number?

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Question 1020505: A password must contain 4 digits from 0-9 and the digits must not be repeated. How many combinations are possible?
Is the answer 10X9X7X8= 5040?
What if its a 4 digit number? Then will we have the answer as: 9X9X8X7?
Thanks
Ekta

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
5040 is correct for a 4 digit number without repetition, N=10%2A9%2A8%2A7.
The second parts doesn't make sense, you already solved for a 4 digit number.
Please repost.