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There are 10 lamps in a hall. Each one o...

There are 10 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

A

`2^(10)`

B

`2^(10)-1`

C

`10^(2)`

D

`10^(2)-1`

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The correct Answer is:
B
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