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The appropriate precedence order of operations over a Regular Language is

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The appropriate precedence order of operations over a Regular Language is

(a) Kleene, Union, Concatenate

(b) Kleene, Star, Union

(c) Kleene, Dot, Union

(d) Star, Union, Dot

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The query is from Building Regular Expressions in section Regular Expressions and Languages of Automata Theory

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Correct option is (c) Kleene, Dot, Union

To elaborate: If a regular language expression is given, the appropriate order of precedence if the parenthesis is ignored is: Star or Kleene, Dot or Concatenation, Union or Plus.

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