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Bebras 2022 - Level 6 Question 13

BEBRAS · Bebras 2022 - Level 6

Question 13

To keep wolves from sneaking into the garden and taking the sheep, the beavers place dogs to guard the gates. One dog can guard an area as shown below.

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The wolf cannot enter through gate 1 but can enter through gate 2. For the following garden, what is the smallest number of dogs needed to guard all the gates?

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  1. 9
  2. 10
  3. 11
  4. 12