Question

There are 10 bulbs in a room. Each one of them can be operated independently. Find the number of ways in

which the room can be illuminated.​

Answer 1

Answer:

Room can be illuminated if more than one lamps are on

=(2,2,2.......2)- 1

For each lamp there are 2 choices- on/off

1 → case when all lamps are off

=2¹⁰−1=1024−1=1023(ANS)

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Answer 2

Answer:

it's better above answer is correct