Twelve wires, each of resistance R, are connected to form a cube as in figure. The effective resistance between the diagonal ends of the cube (1 to 7) is
1
5R/6
2
6R/5
3
3R
4
12R
Twelve wires, each of resistance R, are connected to form a cube as in figure. The effective resistance between the diagonal ends of the cube (1 to 7) is