C. Indicate the appropriate set operation symbol inside the box.
1. {fri,en.d}{i‚f, e} = {f. e}
{É
2. (1,2,3,4)
(4, 5, 6) = {4}
(1,3,5)
3.
4.
(7,9,11) = {}
{co‚l‚r‚s}{o, d. r} = {c, l, s}