 Hello and welcome to the session. In this session we discussed the following question which says how many five-digit numbers are there in all. Let's see its solution now. First of all let's see what is the largest five-digit number. The largest five-digit number is equal to 99999. Now the smallest five-digit number is equal to 10000. Now we have to find the total number of five-digit numbers. So number of all five-digit numbers is equal to the largest five-digit number which is 99999 minus the smallest five-digit number which is 10000 plus 1. This could give us the number of all five-digit numbers. So we get this is equal to 89999 plus 1 which is equal to 90000. So hence we say there are in all 90000 of five-digit numbers. So with this we complete the session hope you have understood the solution of this question.