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MCQ (Single Correct Answer)
GATE CSE 2003
Consider the set ∑* of all strings over the alphabet ∑ = {0, 1}. ∑* with the concatenation operator for strings(A) does not form a group(B) forms a non-commutative group(C) does not have a right identity element(D) forms a group if the empty string is removed from ∑*
