Answer:
U = { N, O, V, E, L, C, R, A, I, U, S }
Step-by-step explanation:
" U " means UNION which the set made by combining the elements of two or more sets.
C { N, O, V, E, L }
D { C, O, R, O, N, A }
E { V, I, R, U, S }
U = ?
U = { N, O, V, E, L, C, R, A, I, U, S }
(all the letters together, no repetitive letters since you just place one letter instead of all the letters that turn out the same)
hope this helped.