question_answer

If \[U=\left\{ 1,\text{ }3,\text{ }5,\text{ }7,\text{ }9,\text{ }a,\text{ }b,\text{ }c,\text{ }d \right\}\]and \[A=\left\{ 1,\text{ }3,\text{ }5 \right\}\]and \[B=\left\{ a,\text{ }b,\text{ }c \right\}\]then \[\left( A\bigcup B \right)'\]

A)  \[\left\{ 3,\text{ }3,\text{ }5,\text{ }a,\text{ }b,\text{ }c \right\}\]

B)         1, 3, 5

C)  \[\left\{ a,\text{ }b,\text{ }c \right\}\]

D)    \[\left\{ 7,\text{ }9,\text{ }d \right\}\]

E)  None of these