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Which of the following regular expression allows strings on {a,b}* with length n where n is a multiple of 4.

(a) (a+b+ab+ba+aa+bb+aba+bab+abab+baba)*

(b) (bbbb+aaaa)*

(c) ((a+b)(a+b)(a+b)(a+b))*

(d) None of the mentioned

1 Answer

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Correct answer is (c) ((a+b)(a+b)(a+b)(a+b))*

Best explanation: Other mentioned options do not many of the combinations while option c seems most reliable.

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