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Assertion: Number of triangles formed by...

Assertion: Number of triangles formed by n concurrent lines and a line which is parallel to one of the n concurrent lines is `"^(n-1)C_2.` Reason: One and only one triangle is formed by three lines out of which 2 are concurrent and third line is not passing through the point of intersection of the concurrent lines and not parallel to any of the concurrent lines. (A) Both A and R are true and R is the correct explanation of A (B) Both A and R are true R is not the correct explanation of A (C) A is true but R is false. (D) A is false but R is true.

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