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a? is equivalent to

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in Automata Theory by (51.1k points)
a? is equivalent to

(a) a

(b) a+Φ

(c) a+ϵ

(d) wrong expression

I had been asked this question by my school teacher while I was bunking the class.

This is a very interesting question from Regular Language & Expression topic in portion Regular Expressions and Languages of Automata Theory

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Best answer
Correct option is (c) a+ϵ

The best explanation: Zero or one time repetition of previous character .

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