Answer:

 If we serve tilapia, then Vanessa will join us for lunch. If Vanessa joins us for lunch, then Gilda will not join us for lunch. Therefore, if we serve tilapia, Gilda will not join us for lunch. Guide Questions: 1. In your own observation, what are the information to consider in justifying whether an argument is valid or not? 2. State in your own words on how to show that a given argument is valid or not. Reflection Recall a very significant childhood experience you have. Narrate it using series of propositions and explain why the argument is valid or not. Write your answer on your journal.