CCAT Syllogisms and Deductions 2

Question 1

Premises: All athletes are disciplined. All disciplined people are successful. Conclusion: All athletes are successful. Is the conclusion valid?

Accepted Answer

Valid

Answer

Invalid

Answer

Possibly valid

Answer

Cannot determine

Question 2

Premises: No fish are mammals. All whales are mammals. Conclusion: No whales are fish. Is this valid?

Accepted Answer

Valid

Answer

Invalid

Answer

Possibly valid

Answer

Cannot determine

Question 3

Premises: Some teachers are authors. All authors are creative. Conclusion: Some teachers are creative. Is this valid?

Accepted Answer

Valid

Answer

Invalid

Answer

Possibly valid

Answer

Cannot determine

Question 4

Premises: All birds have feathers. This animal has feathers. Conclusion: This animal is a bird. Is this valid?

Accepted Answer

Invalid — affirming the consequent

Answer

Valid

Answer

Valid only if the animal is small

Answer

Cannot determine

Question 5

Premises: No vegetarians eat meat. Sarah eats meat. Conclusion: Sarah is not a vegetarian. Is this valid?

Accepted Answer

Valid

Answer

Invalid

Answer

Possibly valid

Answer

Cannot determine

Question 6

Premises: All politicians make promises. Some promise-makers are liars. Conclusion: Some politicians are liars. Is this valid?

Accepted Answer

Invalid

Answer

Valid

Answer

Possibly valid

Answer

Cannot determine