how many telephone lines needed show work


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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 18th, 2017

Every pair of building is to be connected. Hence 2 to be chosen from 10.

10C2 =10*9/2=45 lines are needed.

Oct 3rd, 2014

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Nov 18th, 2017
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Nov 18th, 2017
Nov 19th, 2017
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