Using the truth table, determine whether the argument form is valid or invalid
.png)
Using the truth table, determine whether the following argument form
is valid or invalid:
.png)
p →q
p v r
∴r
Solution:
|
p |
q |
r |
Premise |
Conclusion |
|
| p →q |
p v r |
r |
|||
|
T |
T |
T |
T |
T |
T |
|
T |
T |
F |
T |
T |
F |
|
T |
F |
T |
F |
T |
T |
|
T |
F |
F |
F |
T |
F |
|
F |
T |
T |
T |
T |
T |
|
F |
T |
F |
T |
F |
F |
|
F |
F |
T |
T |
T |
T |
|
F |
F |
F |
T |
F |
F |
The following argument form is invalid because in one row both the premise are true but the conclusion is false.
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