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Working with whole numbers only . . .

- The smallest one is 100,000,000 .

- The largest one is 999,999,999 .

That's (all the counting numbers up to 999,999,999) minus (the first 99,999,999 of them) =

900,000,000 numbers (nine hundred million)

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Q: How many 9 digit numbers r there?
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How many seven digits number can be made from numbers 123456789 but no repititions are allowed?

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If using numbers 1 thru 49 how many 6 digit combinations can be made?

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How many combinations of 9 if you had to use all 9?

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