Please tell the answer of 4 i part

Dear student,

Please find the below required solution of Q4(i).

$$\begin{gathered} \frac{1}{3}-\frac{1}{6} = \frac{1\times 2-1}{6} \\ = \frac{2-1}{6} \\ = \frac{1}{6} \end{gathered}$$

Regards.