ANSWERS: 3
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You can't mix two colors together to get red. As you said, it is a primary color. You may be able to get a reddish brown to where it almost looks red after mixing or you can get a lighter red. Unless you mean mixing red and white to get pink and then mixing in more red to make it red again. You've only used to paint colors then.
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black and pink
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In color printing they use magenta and yellow to make red. http://en.wikipedia.org/wiki/Primary_colors
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