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Miscellaneous Exercise 1 · Q155

Q.If A={1,2,3,4,5,6,7,8,9}A = \{1, 2, 3, 4, 5, 6, 7, 8, 9\}, determine the truth value of the statement: ∀ x∈A, 3x≤25\forall\, x \in A,\ 3x \leq 25.

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The statement claims 3x≤253x\leq25 (i.e. x≤8.33…x\leq8.33\ldots) holds for every x∈A={1,…,9}x\in A=\{1,\dots,9\}. But AA includes x=9x=9, and 3×9=27>253\times9=27>25, so the inequality fails there. Since the universal claim fails for this element, the sta …

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