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BEBRAS 2026 Grade 3-4 Round 2 Ext Question 2

BEBRAS · BEBRAS 2026 Grade 3-4 Round 2 Ext

Question 2

Sticky rice cake is often cut with strings rather than a knife because the cake is sticky. These pictures show one-string cutting.

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Several strings may also be used, but must be pulled in the right order so they do not catch on each other. In the two-string example, pull the white string before the grey string; reversing that order traps the grey string.

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In what order should the four strings below be pulled?

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  1. ABDC
  2. BCAD
  3. CDBA
  4. DACB