\(X\cup Y=A=\left\{0;2;4;6\right\}\)
\(\left(A\cap B\right)\subset X\Leftrightarrow\left\{4;6\right\}\subset X\)\(\Rightarrow X\in\left\{4;6\right\},\left\{4;6;0\right\},\left\{4;6;2\right\},\left\{4;6;0;2\right\}\)
Từ đó ta có các cặp X Y thỏa mãn đề