Question

If $A=\{1,2,3,4,5,6,7,8\}$ and $B\{1,3,5,7\}$, then find $A-B$ and $A\cap B$

• A. $\{3,5\}$ and $\{2,4,6\}$
• B. $\{2,4,6\}$ and $\{1,5\}$
• C. $\{2,4,6,8\}$ and $\{1,3,5,7\}$
• D. $\{1,3,5,8\}$

Answer 1

Answer: (C)

$\{2,4,6,8\}$ and $\{1,3,5,7\}$

$A=\{1,2,3,4,5,6,7,8\}$

$B=\{1,3,5,7\}$

$A-B=\{1,2,3,4,5,6,7,8\}-\{1,3,5,7\}=\{2,4,6,8\}$

$A\cap B=\{1,2,3,4,5,6,7,8\}\cap \{1,3,5,7\}=\{1,3,5,7\}$