Two lines intersect at O. points A_(1),A_(2), . . .A_(n) are taken on – InterviewSolution

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1.	Two lines intersect at O. points A_(1),A_(2), . . .A_(n) are taken on one of them and B_(1),B_(2), . . .,B_(n) on the other, the number of triangle that can be drawn with the help of these (2n+1) points are:
Answer» N `n^2` `n^3` `n^4` ANSWER :C

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