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Natural numbers are just whole positive numbers. Since whole positive numbers can represent a distance along a line, they are a subset of real numbers.
The letter Q in blackboard bold is used to represent the set of rational numbers - Q standing for quotient.
variable
why an set of integer denoted by z
we represent the letter Z in our sets of numbers. for eg:- Z= 1,7,2,8,3,9,4,5,6