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Let there are 4 processes P1, P2, P3 and P4 whose arrival time is 0 milliseconds and CPU burst time are 6, 8, 7 and 3 milliseconds respectively. If the operating system uses shortest job first scheduling algorithm, then the difference between waiting time of process P3 and P₁ is 1) 3 milliseconds 2) 6 milliseconds 3) 9 milliseconds 4) 12 milliseconds

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