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There are 10 points in a plane out of which 4...

This question belongs to Arithmetic Ability Permutation And Combination
Permutation and Combination
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There are 10 points in a plane out of which 4 are collinear. Find the number of triangles formed by the points as vertices.

Answer & Solution
Correct Answer: Option B
The number of triangle can be formed by 10 points = 10C3
Similarly, the number of triangle can be formed by 4 points when no one is collinear = 4C3
In the question, given 4 points are collinear, Thus, required number of triangle can be formed,
= 10C3 - 4C3
= 120 - 4
= 116
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1 Comment
Shivani
Shivani 11 years ago
please give another easy method.....
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