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Question
If A = {1, 2, 3, 4, 5, 6, 7, 8, 9}, determine the truth value of the following statement:
∃ x ∈ A such that x + 8 = 15
Solution
Clearly x = 7 ∈ A satisfies x + 8 = 15. So the given statement is true, hence its truth value is T.
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