How many 5 dijit are there in all
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The smallest 5 digit number is 10000. The largest is 99999. 99999 minus 10000 is 89999, but since you have a zero-based count, you have to add 1. That means there are a total of 90000 different 5 digit numbers.
If you disallow zeros in all 5 digits, there are 9 ways to choose the first digit, 9 ways to choose the 2nd digit, and so on so there are 5 digit numbers that have no zeros at all.
Hence the difference between 90000 and 59049 is the number of 5 digit numbers with at least one zero.
My calculator said it, I believe it, that settles it
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