Can anyone show me an example of how to do "modus ponens and "modus tollens". I have to write an argument in symbols using sentence letters and truth functional connectives. I have no clue to grasp the concept.

Answer 1

A conditional sentence with a false antecedent is always (Points : 1)
true.
false.
Cannot be determined.
not a sentence.


2. What is the truth value of the sentence "P v ~ P"? (Points : 1)
True
False
Cannot be determined
Not a sentence


3. "Julie and Kurt got married and had a baby" is best symbolized as (Points : 1)
M v B
M & B
M ¡æ B
M ¡ê B




4. If P is false, and Q is false, the truth-value of "P ¡êQ" is (Points : 1)
false.
true.
Cannot be determined.
All of the above.


5. Truth tables can (Points : 1)
display all the possible truth values involved with a set of sentences.
determine what scientific claims are true.
determine if inductive arguments are strong.
determine if inductive arguments are weak.


6. The sentence "P ¡ê Q" is best read as

(Points : 1)
If P then Q
If Q then P
P or Q
P if and only if Q


7. A sentence is said to be truth-functional if and only if (Points : 1)
the sentence might be true.
the truth-value of the sentence cannot be determined from the truth values of its components.
the truth-value of the sentence is determined always to be false.
the truth-value of the sentence can be determined from the truth values of its components.


8. If P is true, and Q is false, the truth-value of "P v Q" is (Points : 1)
false.
true.
Cannot be determined
All of the above


9. The sentence "P ¡æ Q" is read as (Points : 1)
P or Q
P and Q
If P then Q
Q if and only P


10. "P v Q" is best interpreted as (Points : 1)
P or Q but not both P and Q
P or Q or both P and Q
Not both P or Q
P if and only if Q


No getting the right anwsers.