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UGC-NET | UGC NET CS 2018 July – II | Question 79

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  • Last Updated : 05 Sep, 2018
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A knowledge base contains just one sentence, ∃x AsHighAs (x, Everest). Consider the following two sentences obtained after applying existential instantiation.
(a) AsHighAs (Everest, Everest)
(b) AsHighAs (Kilimanjaro, Everest)
Which of the following is correct with respect to the above sentences ?
(A) Both sentence (a) and sentence (b) are sound conclusions.
(B) Both sentence (a) and sentence (b) are unsound conclusions.
(C) Sentence (a) is sound but sentence (b) is unsound.
(D) Sentence (a) is unsound but sentence (b) is sound.

Answer: (C)


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