document.write( "Question 891444: the number of distinct lines that can b formed by joining 20 points on a plane of which no 3 points are collinear \n" ); document.write( "
Algebra.Com's Answer #539764 by AnlytcPhil(1806)\"\" \"About 
You can put this solution on YOUR website!
\r\n" );
document.write( "Since line segment AB is the same as line segment BA, order does not matter,\r\n" );
document.write( "so we use combinations.  We have:\r\n" );
document.write( "\r\n" );
document.write( "20 points CHOOSE 2 or C(20,2) = 190\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" ); document.write( "
\n" );