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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 ?
Correct answer: D. Sentence (a) is unsound but sentence (b) is sound.
EI must use a fresh constant. Everest already appears in the KB, so (a) is unsound; a new name such as Kilimanjaro (not in the KB) is a legitimate Skolem constant, so (b) is sound.
Consider the set of all possible five-card poker hands dealt fairly from a standard deck of fifty- two cards. How many atomic events are there in the joint probability distribution ?
Correct answer: A. 2, 598, 960
Each atomic event is one 5-card hand: C(52, 5) = 2,598,960.
