Questions
There are n concurrent lines and another line parallel to one of them. The number of different triangles that will be formed by the (n + 1) lines, is
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Correct option is B
The number of triangles = number of selections of 2 lines from the (n – 1) lines which are cut by the last line=n−1C2=(n−1)!2!(n−3)!=(n−1)(n−2)2Similar Questions
There arepoints in a plane, no two of which are in a straight line except 4, all of which are in a straight line. The number of triangles that can be formed by using these points is
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