how many telephone lines needed show work

Mathematics
Tutor: None Selected Time limit: 1 Day

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

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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Oct 3rd, 2014
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Oct 3rd, 2014
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