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Premise: There is an undeclared or there is a syntax error in the first five lines
Premise: If there is a syntax error in the first five lines, then there is a missing semicolon
Conclusion: There is not a missing semicolon
Let P=There is an undeclared variable
Q=There is a syntax error
R=There is a missing semicolon
The premises and conclusion can be stated as:
We can construct a truth table for
From the table above, we can see that the statement is not always true. Hence, the argument is INVALID.