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a? is equivalent to

a+?

wrong expression

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Regular expression x/y denotes the set

{x,y}

{xy}

{x}

{y}

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The set of all strings over ? ={a,b} in which a single a is followed by any number of b

ab* + ba*

ab*ba*

a*b + b*a

None of these

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Regular expression are

Type 0 language

Type 1 language

Type 2 language

Type 3 language

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Which of the following pairs of regular expressions are equivalent?

1(01)* and (10)*1

x (xx)* and (xx)*x

x^+ and x^+ x^(*+)

All of the mentioned

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Given a NFA with N states, the maximum number of states in an equivalent minimized DFA is at least

N²

2^N

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