The set of all strings over = {a,b} in which all strings having bbbb – McqOptions

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1.	The set of all strings over = {a,b} in which all strings having bbbb as substring is?
A.	(a+b)* bbbb (a+b)*
B.	(a+b)* bb (a+b)*bb
C.	bbb(a+b)*
D.	bb (a+b)*
Answer» B. (a+b)* bb (a+b)*bb

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