Asked by Anonymous
If 10 points are arranged on a circle, how many lines are needed to join every point to every other point once? First solve simpler problems to determine a pattern.
Answers
Answered by
Reiny
You are choosing any pair from 10 choices
the number of such cases = C(10,2)
or 10!/(8!2!) = 45
the number of such cases = C(10,2)
or 10!/(8!2!) = 45
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