Question

There are 7 villages to be connected by a telephone lines between them each village has to be connected to all the other village directly .how many telephone lines have to be laid?​

Answer 1

Answer:

7 telephone lines have been laid

I hope it helps you

Step-by-step explanation:

Answer 2

Answer:

21

Step-by-step explanation:

use the formula 1/2{n×(n-1)} where n is number of telephone lines.

1/2{7×(7-1)}

1/2(7×6)

1/2 × 42

42/2

21.

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