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JEE Main Mathematics question

MathematicsPermutations and CombinationsJEE Main

There are lamps in a hall. Each one of them can be switched on independently. The number of ways in which the hall can be illuminated, is

Answer: (C)

Solution

Each lamp is either on or off, so there are states of the lamps. The hall is illuminated if at

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Question ID VK-020562