



 
Daniel, How many one digit numbers can you form with no repeats? That's clear, there are 10. They are 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. How many two digit numbers can you form with no repeats?
How many three digit numbers can you form with no repeats?
How many four digit numbers can you form with no repeats? Penny  


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