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There are 11 points in a plane. No thre...

There are 11 points in a plane. No three of these lies in the same straight line except 4 points, which are collinear. Find ,
(i) the number of straight lines that can be obtained from the pairs of these points ?
(ii) the number of triangles that can be formed for which the points are their vertices ?

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The correct Answer is:
(i) 50
(ii) 161
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SURA PUBLICATION-COMBINATORICS AND MATHEMATICAL INDUCTION -EXERCISE 4.3
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  18. How many triangles can be formed by 15 points , in which 7 of them ...

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  19. There are 11 points in a plane. No three of these lies in the same ...

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