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Question
Let X = {1, 2, 3, 4, 5, 6}. If n represent any member of X, express the following as sets:
n + 5 = 8
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Solution
Let B = {x | x ∈ X and x + 5 = 8}
Here, B = {3}
As x = 3 ∈ X and 3 + 5 = 8 and there is no other element belonging to X such that x + 5 = 8.
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