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What is the power set of S = {1,2} A = {1,2} and B = {2,1}, are they equal, why are and {} the same,

  1. What is the power set of S = {1,2}
  2. A = {1,2} and B = {2,1}, are they equal, why
  3. are and {} the same, why
  4. is (2,3] equal to 2

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