SOLUTION: A road is built to connect each pair of cities. How many roads for 12 cities if each road can connect only two cities?

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Question 1187182: A road is built to connect each pair of cities. How many roads for 12 cities if each
road can connect only two cities?
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.

The number of roads = %2812%2A11%29%2F2 = 66.


Each of 12 cities is connected with all other 11 cities,

and each road connects two cities.

Solved, answered and explained.