Three colors
Classical Mechanics
Level
2
The above LED (Light Emitting Diode) sign can make yellow, green and red letters. If this sign is made by two colors of LED, what would be the two colors?
Blue-Red
Red-Yellow
Red-Green
Green-Yellow
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1 solution
There are 3 basic colours : Red, blue, green ... here there is no blue colour in the visual so" red and green" will be the answer.