URGENT!! how many lines can be drawn through n coplanar points, no three of which are collinear?

Question

this has something to do with geometry... pls answer this one....

Answer 1

to draw lines u hav to select 2 points at a time (as no 3 r collinear)

thus no of selections of such points is nC2= n!/ [ 2! (n-2)!]

Answer 2

(n-1)(n)/2

Answer 3

n lines