Logical Question

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22 Tháng mười 2017
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Mr. Perfect can mow his lawn efficiently, that is, he can mow his whole lawn in a continuous line from start to finish without having to go over an already mown part, as shown by the blue path below:
5qmDnS6OF9-perfectr.png

No matter how hard Mr. Mediocre tries, he can't mow his lawn (shown below) as efficiently as Mr. Perfect can. A friend suggests that Mr. Mediocre plant a shrub somewhere to change the layout of his yard.
Where should Mr. Mediocre plant the shrub so that he can mow his lawn efficiently?
ofzlq8YN74-mediocre.png

Explain why can't Mr.Mediocre mow his lawn efficiently without planting the shrub?
Nguồn ảnh: Brilliant.org

[TEX]\Huge{Hint:}[/TEX] color the garden into [TEX]\color{green}{green}[/TEX] and [TEX]\color{black}{black}[/TEX] squares
 
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