m points on one straight line are joined to n points on another straight line. The number of points
Channel: Doubtnut
Date: 12/04/2020

m points on one straight line are joined to n points on another straight line. The number of points of intersection of the line segments thus formed is (A) `^mC-2.^nC_2` (B) `(mn(m-1)(n-1))/4` (C) `(^mC_2.^nC_2)/2` (D) `^mC_2+^nC_2`