# Recent questions and answers in Permutations and Combinations

Questions from: Permutations and Combinations

### 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 other. The no. of triangles that can be drawn from with the help of these 2n points and point 'O' is ?

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