White
When light shines on a yellow paper it passes through the paper and becomes yellow as the contrast of the paper is yellow hence the yellow color of the paper absorbs the light given and converts it into a yellow light.
red
The answer has a lot to do with why you call it "red paper". Could that be becausethe paper absorbs light of any other color, and reflects the red light toward your eyes ?
Green
White light is made up of all the colors. If a paper is white, it is reflecting all the colors of light. We know that the color of an object is determined by the color(s) of light it reflects. If an object is green, for example, it reflects green light and absorbs all other colors.
White
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