Silhouette coefficient

You are given the following synthetic clusters:

$$\text{Cluster 1} = [\{2, 5\}, \{2, 3\},\{3, 4\} ] \\ \text{Cluster 2} = [\{6, 1\}, \{6, 3\},\{7, 2\} ] \\ \text{Cluster 3} = [\{4, 1\}, \{4, 2\},\{5, 1\} ] \\$$Calculate the silhouette value for $\{2, 5\} \in \text{Cluster 1}$. Round the results of the intermediate calculations up to the third decimal point. The final answer should be rounded up to the second decimal point.