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    Please provide answers to the following three exercises/questions

    Please provide answers to the following three exercises/questions.

    1. Please provide a natural deduction proof for the following valid, deductive argument:

    Premise 1:  ~ ( F & A )

    Premise 2:  ~ ( L v ~ A )

    Premise 3:  D > ( F v L )              / ~ D

    2. Answer the following question:  can one invalidity with the natural deduction proof method?  Why or why not?

    3. Answer the following the question:  can one construct a natural deduction proof for an invalid argument in SL?  Why or why not?

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