Consider the 3 processes, P1, P2 and P3 shown in the table

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Consider the 3 processes, P₁, P₂ and P₃ shown in the table :

The completion order of the 3 processes under the policies FCFS and RR2 (Round Robin scheduling with CPU quantum 2 time units) are

1. FCFS : P₁, P₂ , P₃ RR2 : P₁, P₂ , P₃
2. FCFS : P₁, P₃ , P₂ RR2 : P₁, P₃ , P₂
3. FCFS : P₁, P₂ , P₃ RR2 : P₁, P₃ , P₂
4. FCFS : P₂, P₁ , P₃ RR2 : P₁, P₂ , P₃

Correct Option: C

Order P₁ → P₂ → P₃
Round robin Here, not P₂ because in the ready queue P₂ comes later than P₃.

Here, not P₃ because in the ready queue P₁ comes first than P₃.
Order P₁ → P₃ → P₂