Let D = \{16, 19, 21\}; E = \{16, 18, 19, 20\} and F = \{15, 17, 18, 19, 21\} List the elements in the set

D U E. D cup E=\ boxed | \ (Use commas to separate answers.)

1 answer

D U E = \boxed{16, 18, 19, 20, 21}.