Maths Olympiad Prep

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, 2015

Combinatorics Difficulty 2.0 Junior Find the answer United Kingdom

Four different straight lines are drawn on a flat piece of paper. The number of points where two or more lines intersect is counted. Which of the following could not be the number of such points?

(A) 11 (B) 22 (C) 33 (D) 44 (E) 55

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