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If A = {5, 6, 7}, B = {6, 7, 8, 9} find A – (A – B) and A ∩ B. What is your observation? |
Answer» A = {5, 7}, B = {6, 7, 8, 9} A – B = {5, 6, 7} – {6, 7, 8, 9} = {5, 6, 7, 8, 9} = {5} A – (A – B) = {5, 6, 7} – {5} = {6, 7} A ∩ B – {5, 6, 7} ∩ {6, 7, 8, 9} = {6, 7} We observe that A – (A – B) = A ∩ B. |
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