Question: For the proof below, what should be written for the justification of line 7? O v D D > O / P > O ?

For the proof below, what should be written for the justification of line 7?

  1. O v D
  2. D > O / P > O
  3. ?
  4. ?
  5. ? 1, 4 DS
  6. ~D 2, 4 MT
  7. D & ~D ?
  8. O ?
  9. P > O ?

Group of answer choices

5, 6 Conj

3, 4 Conj

3, 6 Conj

7 Add

7 Simp

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