Take an outline map of the lower 48 U.S. states and four crayons. Can you shade in the map so that every state is a different color than each of its neighbors, without resorting to a fifth color? This ...
URBANA — Here's the task: Color a map of the United States so that no two adjacent states have the same color. What's the least amount of colors you would need? The answer to that question took ...
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