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[True or False, with justification] For each of the following four questions, state TRUE or FALSE. Justify your answer with a short proof or simple

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[True or False, with justification] For each of the following four questions, state TRUE or FALSE. Justify your answer with a short proof or simple counterexample. (a) Let A be NP-complete and B be NP-hard. Then B spA (b) The set of all Turing-recognizable la (c) If L and L2 are Turing-recognizable, then L2L,is also Turing- nguages is countably infinite. recognizable

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