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ICT DOUBT ???

A

ahmed soliman

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i read a question about sensors where a washroom lights switches on as someone enters it and when it is unoccupied the lights switch off within 10 seconds
question:what sensor is used to give information to the computer system that the washroom is occupied or not ??
 
egy

egy

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question ?
can someone help me in COUNTIF and SUMIF because i am not getting the answer right:confused:

Thanks in advance :)
 
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