Question 1178299
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No way to determine this unless you specify that the points are colinear and in some specific order such as JKLM left to right.  There is nothing in your question that would allow me to assume any particular configuration.  Repost with all of the information and an explanation of why you are having trouble with the question.

																
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
*[illustration darwinfish.jpg]

From <https://www.algebra.com/cgi-bin/upload-illustration.mpl> 
I > Ø
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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