*Definition of Set: Set is well defined collection of objects.

  Objects in Set are called elements of Set.

  Elements are said to be ‘belong to’ set.

  Example: A = {a, b, c, d} is a Set and a, b, C, d are element of Set A

  Here a, b, c, d belongs to A or
$$ \style{font-family:’Times New Roman’}{\style{font-size:36px}{a,b,c,d\in A}} $$

And If 2, 3, 4, 5 are not element of Set A

Here 2, 3, 4, 5 doesn’t  belongs to A 


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