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Q.

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 amount of illumination is

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a

122−1

b

212

c

212−1

d

122

answer is C.

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Detailed Solution

For each bulb there are two possibilities. It will be switched either on or off. Hence, total number of ways in which the room can be illuminated is 212−1.
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