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Question

a * H = H * a relation holds if __________

a.

H is semigroup of an abelian group

b.

H is monoid of a group

c.

H is a cyclic group

d.

H is subgroup of an abelian group

Answer: (d).H is subgroup of an abelian group

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Q. a * H = H * a relation holds if __________

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