R is resources ,n is number of processes and Si is resource copy alloted for each process.
- If deadlock present R<=$\sum_{i=1}^{n}Si-n$
- No Deadlock R>$\sum_{i=1}^{n}Si-n$
5 processes and R copies of total resources in a system, each process requires 7
now R<=(5*7)-5
R<=30 so for R=30 deadlock is possible