Question: Say that you are working backwards on this proof: 1. F B 2. B 3. ___________________ F E Which of the following is needed on

Say that you are working backwards on this proof:

1. F B 2. B 3. ___________________

F E

Which of the following is needed on line 3 to complete the proof?

F (Modus Ponens, 1, 2)

B E (Conjunction Introduction, 2)

F (Modus Tollens, 1, 2)

F (Premise)

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