Which of the following sets are equal, Mathematics

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Which of the following sets are equal?

S1 = {1, 2, 2, 3},

S2 = {x | x2 - 2x + 1 = 0},

S3 = {1, 2, 3},

S4 = {x | x3 - 6x2 + 11x - 6 = 0},

Ans: The elements of S2 and S4 is given like this:

S2 = {1, 1} and S4 = {1, 2, 3}

Two sets are said to be equal if both consist of same elements and the multiplicity of each element is similar in both the sets. This implies that S3 and S4 are equal. Although S1 has similar elements as in S3 and S4, it not equal as multiplicity of 2 in S1 is 2 whereas that in S3 and S4 is 1

 


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