1.

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
Answer» D.   \[\left\{ 3 \right\}\]


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