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A 5 LED light display on a hallway is used to notify a nurse which patient...

A 5 LED light display on a hallway is used to notify a nurse which patient has pressed their call button. How many patients can be identified when 1 or more lights are active ?

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Answer #1

Number of patients can be identified when 1 or more lights are active
= 2^5-1
= 32-1
= 31
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