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How many page faults would occur for following replacement
algorithms for a memory with 4 frames? Remember that all frames
are initially empty, so your first unique pages will all cost one
fault each.
(i)  LRU replacement.
(ii)  FIFO replacement.
(iii)  Optimal replacement.


What is a System? Explain important terms of the system in software engineering.

Purpose, Boundary, Environment, Inputs, and Outputs are some important terms
related to Systems.
  • A System's purpose is the reason for its existence and the reference point for measuring its success.  
  • A System's boundary defines what is inside the system and what is outside. 
  • A System Environment  is everything pertinent to the System that is outside of its boundaries. 
  • A System's input are the physical objects and information that cross the boundary to enter it from its environment. 
  •  A system's Outputs are the physical objects and information that go from the system into its environment.