FIFO (FCFS) in multiprogramming

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I have a question:

In which scenario FIFO (First In First Out) scheduling is possible in multiprogramming when we have only 1 processor?

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Multiprogramming concept is the ability of the operating system to have multiple programs in memory.

Multiprogramming actually mean switching between the processes or interleaving the I/O time and CPU time of processes.

So it is independent of number of processors.(i.e. Even if there is only one processor it may be working on multiple programs.)