operating system - Ways to select a process from a ready queue -

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i came across multiple-choice question in interview answered answer option a: n!. but, i'am still not sure answer.
question was:

in ready queue containing n process, new process can selected in how many ways?

a. n!
b. n*n
c. log n
d. n

cfs, has complexity of o(log n), since uses rb tree internally.

http://en.wikipedia.org/wiki/completely_fair_scheduler


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