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OpenStudy (anonymous):
on a piece of paper, 8 points are marked such that no 3 points lie on the same straight line. how many lines can be drawn passing through any 2 of these points?
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OpenStudy (anonymous):
\[\binom 8 2 = 28\]
OpenStudy (anonymous):
I'll be glad if u can explain a bit...
OpenStudy (anonymous):
Since no three points are collinear, this problem reduces to "In how many ways we can select 2 points from 8 distinct points?"
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