How many triangles can be obtained by joining 12 points, five of which are collinear?
Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM
The number of triangles by 12 non-collinear points are , but 5 points are collinear.
Thus, the numbers of triangle are
Answered by | 4th Jun, 2014, 03:23: PM
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