Xinding Sun from University of California, Santa Barbara found yet another twist to the problem.įurther variants are discussed at the CTK Exchange - the old archive. Step 2: Connect the dots with a continuous line by starting at any dot and ending at a. Thought and points out even more of self-imposed restrictions that I missed considering the 9-point problem Step 1: Draw 9 dots on a sheet of paper in a 3x3 grid formation. Can you draw 4 straight lines, without picking up your pen, that go through all 9 dots. Now, try to think of a restriction you imposed on yourself which was not inherent to the problem.Īs an aside, Lars Hellvig from Stockholm, Sweden picks up this line of The solution lies in the observation that it's permissible to cross square boundaries. Join the nine dots in a 3-by-3 two-axis grid by 4 straight lines without visiting a dot more than once and without raising your pencil from the paper. Try connecting all nine dots using four lines. For one always comes up with 5 lines instead of 4. How to use the nine dot puzzle template in Lucidspark Use the pen tool to connect the dots. The problem is to connect the dots with no more than 4 straight lines without lifting your hand from the paper. One classical example is where nine dots are arranged on the sides and the center of a square as in the picture below. FIGURE 5.3 The Nine Dots exercise, with three of four lines drawn From here. The best hint, in my view, is to mention that often, when solving a problem, we implicitly impose constraints that have not come with the problem. Use a pen to connect the dots while adhering to these four rules.
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