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प्रश्न
A hall has 12 lamps and every lamp can be switched on independently. Find the number of ways of illuminating the hall.
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उत्तर
Every lamp is either ON or OFF.
There are 12 lamps
Number of instances = 212
This number includes the case in which all 12
lamps are OFF.
∴ Required Number = 212 – 1 = 4095
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