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Mathematics 14 Online
OpenStudy (anonymous):

twenty points are marked in a straight line, and 15 points are marked in a line parallel to it. How many triangles can be formed using these points?

OpenStudy (anonymous):

Can someone check if my answer is right? I did (20C1*15C2) +(20C2*15C1)=4950 therefore there are 4950 ways to form a triangle with these points

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