Class 11 Maths Sets Equal sets

Equal sets

Two sets A and B are said to be equal if they have exactly the same elements and we write A = B.

Otherwise, the sets are said to be unequal and we write A ≠ B.

Examples :

 Let A = {1, 2, 3, 4} and B = {3, 1, 4, 2}. Then A = B.

Let C = {1, 2, 3, 4} and D = {1,2,3,5}. Then C ≠ D.

 

If set  A = {1, 2, 3} and B = {2, 2, 1, 3, 3}. Then A=B , since each element of A is in B and vice-versa. That is why we generally do not repeat any element in describing a set.

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