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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?
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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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