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BEBRAS 2026 Grade 9-10 Round 2 Ext Question 5

BEBRAS · BEBRAS 2026 Grade 9-10 Round 2 Ext

Question 5

The tree has numbered leaves carrying groups of two or three letters.

Question illustration

Encode a letter with two digits: first its leaf number, then its position in that leaf’s letter group. For example CAR is 13–11–63. How is VIETNAM encoded?
  1. 81–33–22–72–52–11–51
  2. 81–33–21–62–61–11–51
  3. 81–33–23–72–51–11–52
  4. 81–33–22–62–52–11–51