PHI 170: Introduction to Logic Test 2 (Thurs.) I. Contradictories (5 points). If “All sweeteners are poisonous substances” is true, (a) what proposition is its contradictory and (b) what is its truth value? Fill in the blanks below: (a)_________________________________________________________(b) _______________ II. Conversion, obversion, or contraposition (15 points). For each sentence below, give TWO legitimate equivalencies. In, the brackets, name the rule you have applied. a. No fly traps are poisonous objects ___________________________________________________________ [ ______________ ] ___________________________________________________________ [ ______________ ] b. Some wishful thinkers are not hopeful people ___________________________________________________________ [ ______________ ] ___________________________________________________________ [ ______________ ] II. Put the following argument into standard form and give its mood and figure (30 points). a. All writers of tax documents are lawyers, since some CPAs are lawyers and all CPAs are writers of tax documents. III. Reconstruct an argument schema using S, P, M instead of actual words. (20 points). a. AOE-3 b. EIA-1 IV. Give Venn diagrams for II and III and test for validity. State the results (25 points) a. b. V. Fil in the gaps in the truth tables below (5 points) p ~p ______ T F F pq p.q ___________ T T T T F T F T F F Extra credit (2 points): name the connectives for ‘not’ and ‘and’ and ‘if…and only if’
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