Question

If n(A) = 7, n (B) = 9 and n (AUB) = 14
then (ANB) = ?
options: 6
4
8
2​

Answer 1

Explanation:

$\huge\boxed{\underline{\mathfrak{\red{   answer}  }    }  }$

${   n(A)=|A|=7        }$

${   n(B)=|B|=9        }$

${  n(AuB)=|AuB|=14         }$

${     |AnB|=(|A|+|B|) -|AuB|   }$

$\implies{  |AnB|=(9+7 )-14     }$

$\implies{    |AnB|=2       }$