Determine whether each argument is valid or invalid. Molly made the following observati...

Determine whether each argument is valid or invalid.

Molly made the following observation: “If I want to determine whether an argument leading to the statement

is valid, I only need to consider the lines of the truth table that lead to T for the column that is headed (p →q) ∧ ∼q.” Molly was very perceptive. Can you explain why her observation was correct?