Switch Aturns lights 1 and 2 on/off or off/on
Answer:
Switch D is faulty.
Switch B turns lights 2 and 4 on/off or off/on
Switch C turns lights 1 and 3 on/off or off/on
Switch D turns lights 3 and 4 on/off or off/on
Switch D turns lights 3 and 4 on/off or off/on
Switches D, C, Aand B are thrown in turn with the result that Figure 1 turns into Figure 2. Which switch does not work at all?
Answer:
Switch D is faulty.
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