Question

how many lines are determined by 10 points. no 3 of which are co-linear.

Answer 1

is answer 45. I just want to cross check. In book answer is 150.

Answer 2

Is this the exact question? are there any more conditions?

Answer 3

no more conditions.

Answer 4

well immediately one would think that the answer is \(\left(\begin{matrix}10 \\ 2\end{matrix}\right)=45\) but that doesn't seem to be the case hmmmm.

Answer 5

are u sure the book is right?

Answer 6

Pretty sure 45 is right. Just did a google search and found this: http://ca.answers.yahoo.com/question/index?qid=20110216112046AAYA0O9

also other sources give the same answer so the book is probably wrong or you're looking at the wrong answer.

Answer 7

book is wrong. We are correct.

Answer 8

I too got the same answer.