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There are 9 slots, if you will, to place numbers. If they can't be used more than once, the answer is 80*79*78*77*76*75*74*73*72. If they can be used more than once, each slot has 80 so that answer would be 809.

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Q: How many 9 digit combinations are there for the numbers 1 through 80?
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Related questions

If using 7 single digit numbers how many different combinations can you get?

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