I got 41 as answer please verify
Using Kruskal Algo
9---10 =2
7-----8 =2
9------5=3
5------6=3
3------4=3
8----12=3
2-----6 =4
6-----11=4
11--12 =5
5------1=6
4-----8 =6
answer= 2+2+3+3+3+3+4+4+5+6+6 =41