SOLUTION: Some One please help to solve this The number of straight lines obtained by joining 16 points on a plane, no twice of them being on the same line is The answer Is 120 I don’t

Algebra ->  Permutations -> SOLUTION: Some One please help to solve this The number of straight lines obtained by joining 16 points on a plane, no twice of them being on the same line is The answer Is 120 I don’t      Log On


   

Question 486759: Some One please help to solve this
The number of straight lines obtained by joining 16 points on a plane, no twice of them being on the same line is
The answer Is 120
I don’t know how to do ???? please Explain


Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

We can form a line by choosing any two points.
number of lines by joining any two out of 16 = 16C2 = 120