3. Let A and B be sets in the universe U.Prove the following statements: (a) A = A. (b) AB if and only if BCA. (c) AnBCA, (d) ACAUB.

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3. Let A and B be sets in the universe U.Prove the following statements:
(a) A = A.
(b) AB if and only if BCA.
(c) AnBCA,
(d) A AUB.
Transcribed Image Text:3. Let A and B be sets in the universe U.Prove the following statements: (a) A = A. (b) AB if and only if BCA. (c) AnBCA, (d) A AUB.
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