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Opinion is accepted 

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Base on my research about optimum, optimal and optimum have the same meaning, that it is refers to the best solution. 

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Optimum express the amount or extent of something most suitable to completion while optimal is most favorable.

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optimum refers to a single value or condition while optimal refers to the best solution

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Optimal also means best or most favorable While optimum can be used as a both adjective and noun whereas optimal can be only used as an adjective.  

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Optimal also means best or most favorable, While optimum can be used as a both adjective and noun.  

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