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Which of the following is regular?

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Which of the following is regular?

(a) a^100b^100

(b) (a+b)*-{a^100b^100}

(c) Both (a) and (b)

(d) None of the mentioned
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The correct choice is (c) Both (a) and (b)

To elaborate: As the language seems to be finite, a dfa can be constructed for the same, thus is regular.
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