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iterative methods are mainly used solving large and complex
problems for which a direct method is not feasible or less
efficient
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there are certain difficulties involved in using these
iterative methods like which method should be used, when to
terminate the process
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a method that works for a particular problem belonging to a
class may not give a solution to another problem of same class
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also the choice to the initial estimate of the variables plays
a significant role in the speed of convergence of the problem