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Show that the argument form with premises $p_1,p_2$,...,$p_n$ and conclusion q → r is valid if the argument form with premises $p_1,p_2,$...,$p_n$,q, and conclusion r is valid.

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Pooja Khatri asked Mar 19, 2019
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What is wrong with this argument? Let $H(x)$ be “$x$ is happy.” Given the premise $\exists x H(x)$, we conclude that $H(Lola)$. Therefore, Lola is happy.