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If F is a free semigroup on a set S, then the concatenation of two even words is ________(a) a semigroup of F(b) a subgroup of F(c) monoid of F(d) cyclic group of FThis question was posed to me at a job interview.This is a very interesting question from Group Axioms topic in chapter Groups of Discrete Mathematics |
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Answer» Right choice is (b) a subgroup of F |
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