Which of the following are non regular?

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answerhappygod
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Which of the following are non regular?

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a) The set of strings in {a,b}* with an even number of b’s
b) The set of strings in {a, b, c}* where there is no c anywhere to the left of a
c) The set of strings in {0, 1}* that encode, in binary, an integer w that is a multiple of 3. Interpret the empty strings e as the number 0
d) None of the mentioned
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