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BEBRAS 2018 Grade 3-4 Round 2 Ext Question 10

BEBRAS · BEBRAS 2018 Grade 3-4 Round 2 Ext

Question 10

A smile detector first replaces a face by two eye dots and a mouth line.

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It places this sketch over a test template with two red eye circles, a red mouth boundary and four black contact points.

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It accepts a smile only when the sketch touches the black points without touching the red outlines. The examples show an accepted face and a rejected face.

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How many of these ten sketches are accepted?

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  1. 3
  2. 4
  3. 5
  4. 6