RMO 2025 Full Solution Q1 | Complete Regional Mathematical Olympiad Paper Discussion | Step-by-Step

RMO 2025 Full Solution Q1 | Complete Regional Mathematical Olympiad Paper Discussion | Step-by-Step Olympiad Math Guide

(a) Let n ≥ 3 be an integer. Find a configuration of n lines in the plane which has
exactly
(i) n − 1 distinct points of intersection;
(ii) n distinct points of intersection;
(b) Give configurations of n lines that have exactly n+1 distinct points of intersection
for (i) n = 8 and (ii) n = 9

Unlock the complete solution discussion of the Regional Mathematical Olympiad (RMO) 2025 in this detailed, step-by-step problem-solving session.
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