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Mathematics
OpenStudy (anonymous):

If A = {red, black} and B = {red, orange, yellow, green, blue, indigo, violet}, what is A U B? A { } B {red, black} C {all colors except red and black} D {red, orange, yellow, green, blue, indigo, violet, black}

OpenStudy (anonymous):

What is U?

OpenStudy (anonymous):

D {red, orange, yellow, green, blue, indigo, violet, black}

OpenStudy (anonymous):

Union, but nevermind I got it.

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