If the San Francisco 49ers lose, then the Dallas Cowboys win. If the Dallas Cowboys win, then

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If the San Francisco 49ers lose, then the Dallas Cowboys win.
If the Dallas Cowboys win, then they will go to the Super Bowl.
Therefore, if the San Francisco 49ers lose, then the Dallas
Cowboys will go to the Super Bowl.


Determine whether each argument in Problems 9–28 is valid or invalid. If valid, name the type of reasoning and if invalid, determine the error in reasoning.

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