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how many telephone lines needed


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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. 

Nov 24th, 2017

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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Nov 24th, 2017
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Nov 24th, 2017
Nov 25th, 2017
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