Complete the truth table below and answer the questions about the following argument: - (p → q) .'.r -(p → q) el + b Row 1 Row 2 F Row 3 Row 4 F F Row 5 F T Row 6 F Row 7 F Row 8 F F (a) Which rows are critical rows? (Just put the row number, do not use spaces and separate each number with a comma. For example: "1,2,3,4") (b) Is the argument valid or valid/invalid? (Enter "valid" or "invalid") LL

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