Question

let u =(1,2,3,4,5,6,7,8,9,) BE UNCIVERSAL SET AND LET A=(2,3,4,5,6) AND B= (3,5,7,8) FIND (A U B)'=( A' intersection B')​

Answer 1

$A\cup B=\{2,3,4,5,6,7,8\}\\(A\cup B)'=A'\cap B'=\{1,9\}$