Question

How many 5-digit numbers are there in all?
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Answer 1

Answer:

the largest 5 digit number are 99999 . 99999 minus 10000 is 89999 but you since have a zero based count ,you have to add 1 . That means there are a total of 90,000 different 5 digit numbers . Hence there are 90,000 5 digit numbers..

I hope it's helpful...