SOLUTION: how many 3 digit numbers can be formed if repetition is allowed?

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Question 559639: how many 3 digit numbers can be formed if repetition is allowed?
Answer by Alan3354(69443) About Me  (Show Source):
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how many 3 digit numbers can be formed if repetition is allowed?
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If 000, 001, etc is accepted, then
10*10*10 = 1000
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If no leading zeroes are allowed, then
100 to 999 = 900