🦘 Math Kangaroo Grade All Felix 1-2 Ecolier 3-4 Benjamin 5-6 Kadett 7-8 Junior 9-10 Student 11-12 ⇄ switch contest
2019 Math Kangaroo

Problem 4

Problem 4 · 2019 Math Kangaroo Medium
Spatial & Visual Reasoning spatial-reasoningsequence-of-figures
Figure for Math Kangaroo 2019 Problem 4
Show answer
Answer: D
Show hints
Hint 1 of 2
Connection means how the loops link: which triangle lies over which at each crossing.
Still stuck? Show hint 2 →
Hint 2 of 2
Track the over/under order (and colours) of the three triangles in the model, then match that exact linking among the options.
Show solution
Approach: match the over-under linking pattern of the three triangles
  1. Record for the shown model which triangle passes over which at each crossing.
  2. Most options reverse one crossing or swap a colour's position.
  3. Only option (D) reproduces the identical over-under linking of all three triangles.
  4. So the answer is (D).
Mark: · log in to save
↑