Consider the set of all strings S * over…

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Consider the set of all strings S * over an alphabet S ={a,b} with the concatenation operator for strings, and
a) the set does forms semigroup

b) the set does not form a group

c) the set has a left and right identity

d) the set forms a monoid

Ravi Garg edited question
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    Sonali Kapoor (anonymous)

    Its b)

    Sonali Kapoor answered
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