SOLUTION: How many different rays can be named given "n" collinear points. I have seen several answers and I'm not sure what is correct. Thanks Carol

Algebra ->  Points-lines-and-rays -> SOLUTION: How many different rays can be named given "n" collinear points. I have seen several answers and I'm not sure what is correct. Thanks Carol      Log On


   

Question 882536: How many different rays can be named given "n" collinear points. I have seen several answers and I'm not sure what is correct.
Thanks
Carol
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
There are n*(n-1) = n^2 - n different ways to pick two points (order matters).