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A bulb in a staircase has two switches, one switch being at the ground floor and the other one at the first floor. The bulb can be turned $ON$ and also can be turned $OFF$ by any one of the switches irrespective of the state of the other switch. The logic of switching of the bulb resembles

  1. an $AND$ gate
  2. an $OR$ gate
  3. an $XOR$ gate
  4. a $NAND$ gate
in Analog and Digital Electronics by (1.5k points)
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