question_answer

If \[A=\left\{ 1,\text{ }5,\text{ }6,\text{ }7,\text{ }8,\text{ }10 \right\}\] and \[B=\left\{ 2,\text{ }4,\text{ }6,\text{ }8 \right\},\]then which one of the following is incorrect?

A)  \[A\cup B=\,\,\left\{ 1,\,\,2,\,\,4,\,\,5,\,\,6,\,\,7,\,\,8,\,\,10 \right\}\]

B)  \[A\cap B=\left\{ 6,\,\,8 \right\}\]

C)  \[A-B=\left\{ 1,\,\,5,\,\,7,\,\,10 \right\}\]

D)  \[B-A=\left\{ 1,\,\,2,\,\,4,\,\,10 \right\}\]

E)  None of these