
#1
May1006, 03:17 AM

P: 322

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. Thanks. 



#2
May1006, 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.




#3
May1306, 09:20 AM

P: 602

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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