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Logic Level 4

What is the least amount of straight lines needed to cover all 64 spots if you were using a pen and it could not be removed from the page?

Treat the spots as a 0-dimensional object. They do not have length or width.

Inspiration .


The answer is 14.

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Pi Han Goh by Pi Han Goh , 30, Malaysia

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1 solution

Rohit Ner
Jun 29, 2015

0 Helpful 0 Interesting 0 Brilliant 0 Confused

Boy, you'd think we could do this using fewer straight lines. Well, I started with 14, and was planning to reduce it by 2 each time I got the message that it wasn't the right answer. It was the right answer after all.

Michael Mendrin - 5 years, 11 months ago

The proof minimum straight lines for n × n n \times n grid is 2 n − 2 2n-2 .

Pi Han Goh - 5 years, 11 months ago

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