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What is 1 + 3?
Red, Yellow, Blue
Orange, Purple, Green
Red-Orange, Red-Violet, Yellow-Orange, Yellow-Green, Blue-Green, Blue-Violet
3 colors right next to each other on the color wheel
2 color directly across from each other
2 sets of complementary colors
Take the complement of one color and the two on each side of the complement
Gray, Black, Brown, White
3 colors with 3 colors in between