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[Groups and Symmetries] How do you solve question 2, thanks
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- 10. Suppose that and are subgroups of the abelian group such that . If is a subgroup of such that , prove that .If H and K are arbitrary subgroups of G, prove that HK=KH if and only if HK is a subgroup of G.43. Suppose that is a nonempty subset of a group . Prove that is a subgroup of if and only if for all and .