MathDB
Intersection of lines

Source: LIMIT 2020 Cat 1 Obj P5

May 2, 2020
countinglimit

Problem Statement

Rohit is counting the minimum number of lines mm, that can be drawn so that the number of distinct points of intersection exceeds 20202020. Find mm.
(A)6363 (B)6464 (C)6565 (D)6666