Which of the following pair of regular expression are not equivalent?

1.	Which of the following pair of regular expression are not equivalent?
A.	1(01)* and (10)1b) x(xx) and (xx)*xc) (a
B.	x(xx)* and (xx)*x
C.	(ab)* and ab
D.	x+ and x*x+
Answer» D. x+ and x*x+

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Which of the following pair of regular expression are not equivalent?

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