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Answer to Question #5428 in Analytic Geometry for maria pretty maths
Question #5428
salam sir please help me by providing the answer of below question.
how many triangles can be formed by joining 12 points ,7 of which lies on the same straight line.
how many triangles can be formed by joining 12 points ,7 of which lies on the same straight line.
Expert's answer
We can make C(12,3) different combinations of these points, but C(7,3) of them will not create triangle. So, there can be formed C(12,3) - C(7,3) = 220 - 35 = 185 triangles.
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