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how many telephone lines needed

Mathematics
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the telephone company is installing telephone lines for ten buildings. each building is to be connected to each of the other buildings with one line. 

Oct 3rd, 2014

Since a pair is to connected by a line, 10C2 =10*9/2 =45 lines will be needed for total connectivity.

Oct 3rd, 2014

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Oct 3rd, 2014
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Oct 3rd, 2014
Dec 9th, 2016
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