Question

Let $A=\{1,2,3,4,5,6,7,8,9,10\}$ and $B=\{2,3,5,7\}$. Then, which of following is truc?

• A. $A\cap B=A$
• B. $A\cap B=B$
• C. $A\cap B\not\subset B$
• D. None of these

Answer 1

Answer: (B)

$A=\{1,2,3,4,\dots ,10\}$
$B=\{2,3,5,7\}$
$\therefore A\cap B=\{2,3,5,7\}=B$