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Question

Every one of the 5 available lamps can be switched on to illuminate certain Hall. The total number of ways in which the hall can be illuminated, is:

A

32

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B

31

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C

5

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D

5!

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Solution

The correct option is B 5
Since the light can be illuminated by 5 switches , so there are 5vways to illuminate the hall. Thus , option c is correct.

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