Valid/invalid Argument Forms

Question 1

Modus ponus

Answer 1

Valid if p then q
p
q

Question 2

Modus tollens

Answer 2

Valid
If p then q
Not q
Not p

Question 3

Disjunctive syllogism

Answer 3

Valid
P or q
Not p
Then q

Question 4

Hypothetical syllogism

Answer 4

Valid
If p then q
If q then r
If p then r

Question 5

Affirming the consequent

Answer 5

Invalid
If p then q
q
Therefore p

Question 6

Denying the antecedent

Answer 6

Invalid
If p then q
Not p
Therefore not q