Natural numbers is first type of number system, in practice natural numbers are denoted by "N". The natural numbers are originated by adding 1 to the antecedent number starting from 1. i.e.. N = 1, 2, 3,…. to get an infinite series of the natural numbers.
 
It is always important to express such numbers as a set. Set is a collection of any well-defined objects. Each well defined individual object is also referred to as an element of that particular set. The concept of a set can be used and popularly used to represent infinite and finite number of elements.

For example: A Set of natural number is represented as

N = {1, 2, 3, 4, 5, 6,……} or {1, 2, 3, 4, 5}

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