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- If the switch is down then the light is on.
- If the switch is not down then the door is open.
- If the door is open then the light is on.
- A. Q⇒P
- B. ~Q⇒R
- C. R⇒P
- D. ~Q⇒P [By {B} and {C}]
- E. P [By {A} and {D}]
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