Asked by Leyla
the circle to the right has 21 points. All possible line segments have been drawn. How many line segments are there?
Answers
Answered by
Reiny
Another way to ask the question,
"in how many ways can I choose any 2 of the 21 points" ?
C(21,2) = 210
"in how many ways can I choose any 2 of the 21 points" ?
C(21,2) = 210
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