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BEBRAS 2019 Grade 7-8 Round 2 Ext Question 14

BEBRAS · BEBRAS 2019 Grade 7-8 Round 2 Ext

Question 14

A wizard has a box that combines two jewels into one. The input jewels must have different shapes, and both their shapes and colors must follow a listed rule.

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Shape rules: triangle+square→circle; triangle+pentagon→square; triangle+hexagon→pentagon; square+pentagon→hexagon; square+hexagon→star; pentagon+hexagon→triangle.

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Color rules: B+Y=R; B+R=G; B+G=O; Y+R=B; Y+G=P; P+O=Y.

The initial jewels are a Y triangle, two G pentagons and a B square.

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Which jewel cannot be obtained?

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Editorial rule convention: inputs are consumed, operations may be repeated, and only combinations explicitly listed in both rule tables are allowed.
  1. R circle
  2. P square
  3. Y star
  4. O pentagon