question_answer

If \[P=\left\{ 1,\text{ }2,\text{ }3 \right\}\]and \[Q=\left\{ 3,\text{ }4,\text{ }5 \right\},\]then \[(P\bigcup ~Q)\text{ }=\text{ }\_\_\_\_\]

A)  \[\left\{ 1,\text{ }2,\text{ }3 \right\}\]

B)         \[\left\{ 1,\text{ }2,\text{ }4,\text{ }5 \right\}\]

C)  \[\left\{ 1,\text{ }2,\text{ }3,\text{ }4,\text{ }5 \right\}\]     

D)         \[\left\{ 3 \right\}\]

E)  None of these