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15 points are placed on a circle. How many triangles is it possible to form, such that their vertices will be the given points?

2 Answers

3 votes

Answer:

455

Explanation:

There are 15 points on a circle.

We need three points to form a triangle

Therefore the number of triangles = 15 choose 3 ​= 15!/(3!x12!)​ = (15x14x13)/(3x2x1) = 5x7x13 = 455

Hence the number of triangles formed is 455

User Seamus Leahy
by
7.1k points
2 votes

Answer: 445 triangles can be form with 15 dots of a circle (I hope good luck)

Explanation:

User Tytk
by
8.5k points

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