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Number of ways question

by physicsss
Tags: number of ways
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May10-06, 03:17 AM
P: 320
A circle has random points on its circumferance. How many ways can you form a quadrilateral, a triangle, and a octagon using these points?

I have no idea how to get an numerical answers for this question without using n to represent the number of points on the circle.

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May10-06, 08:24 AM
P: 213
I think using 'n' is fine...just make a correct formula such that for any n you can get a specific answer.
May13-06, 09:20 AM
P: 601
Of course you need n.
In how many ways can you choose the vertices of an r sided polygon from n points ?

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