Question

How many 4- digit no. In all are there in base 10 system

Answer 1

First, you need to know what a "base" number system is and how it works. You can use our number system, which is base 10, as a model for any other base you want. How does base 10 work? Well, the base tells you how many digits you have. Base 10, ten digits. Each digit will have a symbol. Base ten uses 0,1,2,3,4,5,6,7,8, and 9. Each digit in a number you write out has a value dependent on where it is in the number.