Many many years ago, human beings (We) invented counting. Since, then the concept related to counting is probably the most greatest discovery in the initial phase of mathematics. We know more about the number systems like real numbers , rational numbers , natural numbers , and so on. And also, we divided the number systems ...

[Aim of this article: This post propose a problem and gives an approach to solve it.] Our problem will go like this: Take any number , and then, take , where and . Find the number of possible choices for and when ? Order doesn’t matter, e.g. and is same as and . To solve ...