SOLUTION: How many four-digit numbers, each less than 600, can be made with the digits 1,3,4,5,7,8 and 9 if a.)repetitions allowed b.) no repetitions are allowed

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Question 1157247: How many four-digit numbers, each less than 600, can be made with the digits 1,3,4,5,7,8 and 9 if a.)repetitions allowed b.) no repetitions are allowed
Answer by ikleyn(52903) About Me  (Show Source):
You can put this solution on YOUR website!
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How many four-digit numbers, each less than 600, can be made with the digits
1,3,4,5,7,8 and 9 if a.)repetitions allowed b.) no repetitions are allowed
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If you mean positive integer numbers (as I understand the problem BY DEFAULT), then

THERE IS NO four-digit numbers, each less than 600.