Math Problem Statement
Quantos pontos comuns a pelo menos duas rectas pode ter um conjunto de três rectas distintas do plano? E um conjunto de quatro rectas?
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Intersection of lines
Combinatorics
Formulas
Number of points of intersection for n lines: C(n, 2) = n(n-1)/2
Theorems
Combinatorial selection for line intersections
Basic properties of parallel and intersecting lines
Suitable Grade Level
Grades 9-12
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