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OpenStudy (anonymous):
There are 25 points on a plane out of which 7 are co-linear.. how many triangle can be formed from these points ? plz tell how to solve..
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OpenStudy (anonymous):
25c3-7c3
OpenStudy (anonymous):
how you reached to that...
OpenStudy (anonymous):
as the 7 points are collinear we have to minus it from the total no. of trianges formed
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