Question

Given
the sets $A=\{4,5,6,7\}$ and $B=\{1,3,8,9\}$. Find $A\cap B$

Answer 1

$A=\left \{4,5,6,7
\right \}$and$B=\left \{1,3,8,9\right \} $.So$A\cap B = \varnothing$.
Hence A
and B are disjoint sets.