Question

If A = {red, orange, black, grey} and B = {red, orange, yellow, green, blue, indigo, violet},
what is A U B?

A {red, orange, black, grey}
B {red, orange, yellow, green, blue, indigo, violet, black, grey}
C { }
D {red, orange}

Answer 1

A U B is the set of either A or B combined


So A U B = {red, orange, black, grey, red, orange, yellow, green, blue, indigo, violet}


and now remove duplicates to get the final answer


A U B = {red, orange, black, grey, yellow, green, blue, indigo, violet}