Question

17. You have two boxes of colored pens. The first box contains a red pen, a blue pen, and green pen. The second box contains a yellow pen, a red pen, and a black pen. What is the set that represents all the pens?
a. {red pen, blue pen, green pen}
b. {red pen}
c. {red pen, red pen, green pen, yellow pen, black pen}
d. {red pen, blue pen, green pen, yellow pen, black pen}

Answer 1

list all of the pen colors and don't forget to remove any duplicate elements