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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
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Correct option is C
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.Similar Questions
The number of ways in which we can get at least 6 successive tails when a coin is tossed 10 times in a row, is
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