U 3 H 6 Exe on validity of syllogism.doc

U 3 H 6 Exe on validity of syllogism.doc - UNIT 3 HANDOUT 6...

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UNIT 3 HANDOUT 6 Dr. S. DEO. Exercises validity of syllogism Logic: Deductive arguments . 37 & 38 Exercise 2.3 Determining the validity of categorical syllogisms All of the following are categorical syllogisms. Determine whether they are valid, and if invalid which rule is violated. 1. All Russians were revolutionaries and all anarchists were revolutionaries. Therefore all anarchists were Russians. Invalid - undistributed middle term (revolutionaries) 2. All perpetual motion devices are 100 percent efficient machines. All 100 percent efficient machines are machines with frictionless bearings. Therefore some machines with frictionless bearings are perpetual motion devices. Valid 3. All chocolate eclairs are fattening foods, because all chocolate eclairs are rich desserts, and some fattening foods are not rich desserts. All C are R All C are F. Therefore, some F are not R. Invalid - neg. conclusion with no neg. Premise 4. No writers of lewd and sensational articles are honest and decent
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  • Spring '18
  • Logic, Syllogism, Medical Association, DR. S. DEO, percent efficient machines

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