# 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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## Comments

Assignment Expert02.12.11, 15:08You are welcome

maria pretty02.12.11, 08:00thank you sir very much.

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