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When we are using sets containing natura...

When we are using sets containing natural numbers, then N is the universal set.n

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A universal set is a set which contains all the elements or objects of other sets.it is denoted by `U`
Let Set A contains of all even numbers `A = {2, 4, 6, 8, 10, …}` and set B contains of all odd numbers, , `B = {1, 3, 5, 7, 9, …}`. universal set U contains of all natural numbers, such that,` U= {1, 2, 3, 4, 5, 6, 7, 8, 9, 10,….}`.
`therefore`, as we know, all the even and odd numbers are a part of natural numbers. `therefore`, Set N is the universal set
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