Is the below argument valid? Prove your answer by replacing each proposition with a variable to obtain the form of the argument. Then prove that the form is valid or invalid.
“If k is a prime number, then 2k-4 is a composite number. 2k-4 is a composite number. Therefore, k is a prime number.”
Q4.1 Identify simple propositions in this argument and assign them letters such as p, q, etc.
Q4.2 Formulate the argument with their assigned letter symbols. (You may need this symbol:
Q4.3 Either prove the argument validity using rules of inference, or prove its invalidity by demonstrating the conclusion of the argument can be false while all the hypotheses are true.
