Based on the solution of the Hungarian Algorithm, list the operations performed by doctors D$1,$ D$2,$ D$3,$ D$4$ by writing the operation numbers with a space in between operations. For instance if Doctor $1$ performs Operation $4,$ Doctor $2$ performs Operation $3,$ Doctor $3$ performs Operation $2,$ Doctor $4$ performs Operation $1,$ write: $4321$

Failure probabilities $(\%)$

$\backslash$table$[[,$Operation $1,$Operation $2,$Operation $3,$Operation $4],[$Doctor$1,1,4,2,3],[$Doctor$2,3,-,7,1],[$Doctor$3,6,2,5,4],[$Doctor$4,4,1,3,2]]$

Cost matrix for the Hungarian algorithm

$\backslash$table$[[,$Operation $1,$Operation $2,$Operation $3,$Operation $4],[$Doctor$1,,a,,],[$Doctor$2,,b,,],[$Doctor$3,,,,],[$Doctor$4,,,,]]$

$4321$

In the cost matrix for the Hungarian algorithm, what is the value of $"$b$"?$

Failure probabilities $(\%)$

$\backslash$table$[[,$Operation $1,$Operation $2,$Operation $3,$Operation $4],[$Doctor$1,1,4,2,3],[$Doctor$2,3,-,7,1],[$Doctor$3,6,2,5,4],[$Doctor$4,4,1,3,2]]$

Cost matrix for the Hungarian algorithm