1.3

Question 1

Fallacy of denying the antecedent

Answer 1

1. If A, then B
2. Not A
   So, 3. Not B

Question 2

Invalid argument form

Answer 2

One that has some invalid substitution instances

Question 3

Counterexample

Answer 3

Substitution instance in which the premises are true and the conclusion is false

Question 4

Fallacy of affirming the consequent

Answer 4

1. If A, then B
2. B
   So, 3. A