If $A=\left\{2,3,5\right\}, B=\left\{2,5,6\right\}$, then $\left(A-B\right)\times \left(A\cap B\right)$ is

Given $A=\left\{2,3,5\right\} \& B=\left\{2,5,6\right\}$

To find $\left(A-B\right)\times \left(A\cap B\right)$

$$\begin{gathered} A-B=\left\{2,3,5\right\}-\left\{2,5,6\right\}=\left\{3\right\} \\ A\cap B=\left\{2,3,5\right\}\cap \left\{2,5,6\right\}=\left\{2,5\right\} \\ \therefore \left(A-B\right)\times \left(A\cap B\right)=\left\{\left(3,2\right);\left(3,5\right)\right\} \end{gathered}$$

Hence option $\left(3\right)$ $\left\{\left(3,2\right),\left(3,5\right)\right\}$ is correct.