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Question
If A = {1, 2, 3, 4}, B = {3, 4, 5, 6}, C = {4, 5, 6, 7, 8} and universal set X = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, then verify the following:
A ∪ (B ∩ C) = (A ∪ B) ∩ (A ∪ C)
Solution
A = {1, 2, 3, 4}, B = {3, 4, 5, 6},
C = {4, 5, 6, 7, 8}
X = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
B ∩ C = {4,5,6}
∴ A ∪ (B ∩ C) = {1, 2, 3, 4, 5, 6} ...(i)
A ∪ B = {1, 2, 3, 4, 5, 6}
(A ∪ C) = {1, 2, 3, 4, 5, 6, 7, 8}
∴ (A ∪ B) ∩ (A ∪ C) = {1, 2, 3, 4, 5, 6} ...(ii)
From (i) and (ii), we get
A ∪ (B ∩ C) = (A ∪ B) ∩ (A ∪ C)
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