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Unformatted text preview: b. x in R such that (x 2 + 2x + 1( < 0 and x = 1 c. computer science student x, is is not a math major. 4. Let R = rain F = foggy S = Sailing Race L = Lifesaving Demo T = Trophy The argument can be written as (~R ~F) (S L) S T ~T R ~T ~S by Modus Tollens ~S ~(S L) by definition of the conjunction ~(S L) ~(~R ~F) by Modus Tollens ~(~R ~F) (R F) by DeMorgans Laws (R F) R by Specialization Therefore, the argument is valid. 5. a. ~s ~r b. s r c. ~r ~s 6. b and c are true. 7. a. 1589 b. 14eb c. 111010101101001111 8. 01110001...
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 Spring '08
 Foster

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