Replace Xiao Wang and Xiao Lin with A and B. A chooses A as 1/3, and B chooses B different from A and adjacent to A as 1/3. Multiply them to get1/9-(1); If A chooses B 1/3, then A and C different from A are 2/3, which are multiplied by 2/9-(2); A chooses C as 1/3, and B chooses B different from A but adjacent to A as 1/3, and the two are multiplied by1/9-(3); ( 1)+(2)+(3)=4/9