0 votes 0 votes If each of ‘a’ points on a straight line is joined to each of ‘b’ points on another straight line, excluding the points on the given two lines,then which of the following represents the number of points of intersection of these lines? Select all that apply. (ab(a-1)(b-1))/4 (ab(a-1)(b-1))/2 ab C(a,2) * C(b,2) Combinatory combinatory counting + – lekh asked Jan 21, 2023 • retagged Jan 21, 2023 by makhdoom ghaya lekh 355 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes option a and d the only way to guarantee an intersection is to select any 2 points from line 1 and any 2 points from line 2. thus, no. of ways to do the above operation is C(a,2) * C(b,2). and option d ↔ option a Pineapple answered Feb 17, 2023 Pineapple comment Share Follow See all 0 reply Please log in or register to add a comment.