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If L1 is regular L2 is unknown but L1-L2 is regular ,then L2 must be

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in Automata Theory by (51.1k points)
If L1 is regular L2 is unknown but L1-L2 is regular ,then L2 must be

(a) Empty set

(b) CFG

(c) Decidable

(d) Regular

The question was asked in an interview for internship.

My doubt stems from Union, Intersection & Complement topic in portion Finite Automata of Automata Theory

1 Answer

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Best answer
Correct choice is (d) Regular

Easiest explanation: Regular is closed under difference.

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