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Chaple Amulahiam & cambinationint on sior)bthese poin |
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Answer» The sides BC,CA,AB of triangle ABC have 3,4,5 interior points respectively on them. How many triangles can be formed using these points as vertices. Total points: 3+4+5=12; Any 3 points out of 12 but those which are collinear will form a triangle, so C 12 3 − ( C 3 3 + C 4 3 + C 5 3 ) = 220 − ( 1 + 4 + 10 ) = 205 . from where this 220 came solve it |
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