Lessons 23-26

Question 1

Validity

Answer 1

depends on the form of the syllogism

Question 2

Invalid

Answer 2

If a syllogism has true premises and a false conclusion

Question 3

Sound syllogism

Answer 3

validand has true premises

Question 4

Counter example

Answer 4

Proving that the syllogism is invalid substituting terms to make the premises true but the conclusion false

Question 5

Distributed terms

Answer 5

Refers to all members of its category

Question 6

Rule no. 1: fallacy of an undistributed middle

Answer 6

In at least 1 premise, the middle term must be distributed

Question 7

Rule no. 2: fallacy of illicit major/minor

Answer 7

If a term is distributed in the conclusion, then it must be distributed in its premise

Question 8

Rule no. 3: fallacy of 2 negative premises

Answer 8

A valid syllogism cannot have 2 negative premises

Question 9

Rule no. 4: negative premise and an affirmative conclusion

Answer 9

a valid syllogism cannot have a negative premise and affirmative conclusion

Question 10

Rule no. 5: fallacy of 2 affirmative premises and negative conclusion

Answer 10

A valid syllogism cannot have 2 affirmative premises and a negative conclusion