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Consider the following circuit given below. The bulb will light up, if
  • A$S_1, S_2$ and $S_3$ are all closed
  • B$S_1$ is closed but $S_2$ and $S_3$ are open
  • C$S_2$ and $S_3$ are closed but $S_1$ is open
  • D$S_1$ and $S_3$ are closed but $S_2$ is open
KVPY 2009, Medium
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