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JEE Advanced Mathematics question

MathematicsPermutations and CombinationsJEE Advanced

In a room there are 12 bulbs of the same wattage, each having a separate switch. The number of ways to light the room with different amounts of illumination is

Answer: (C)

Solution

Each bulb is either on or off: switch settings. The setting with all bulbs

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Question ID VK-108181