A few days ago
Geometry math question?
When there are 3 points, there are 3 segments that can connect them, when there are 4 points, there are 6 segments that can connect them, when there are 5 points, 10 segments can connect them, when there are 6 points, 15 segements can connect them. When there are n points, who many segments can connect them?
Top 1 Answers
A few days ago
Favorite Answer
This is the number of combinations of 2 from n, written C(n,2) or nC2.
The formula to evaluate this is:
n! / 2!(n – 2)!
which can be reduced to:
n(n – 1)/2.
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