Question

how many six digit numbers are there in all​

Answer 1

Answer:

999,999 is the total number of numbers from 1 to 999,999. Now, you just want the number of 6 digit numbers. Let's take the highest 5 digit number which is 99,999. 99,999 is the number of numbers from 1 to 999,999 which aren't a 6 digit number.