Problem: If webserve tilapia, then Sven will join us for lunch . If Sven joins us for lunch, then Krobelus will not join us for kunch . Therefore ,if we serve tilapia, Krobelus will not join us for lunch.

Solution: Label the statements: t: We serve tilapla. s: Sven will join us for lunch. k: Krobelus will not join us for lunch The symbolic form of the argument is tS sk The truth table for this argument follows. t g k t-s sk TT V tk row 1 TIT F row 2 T F T row 3 F row 4 FT row 5 F F I F row 6 FF T row 7 FF F row B The rows in which both premises are true are rows 2. 6. 7 and 8. Because the conclusion is true in each of these rows the argument is