1. Let G be a group and H be a subgroup of G of index equal to 2. Prove that H G
2. Let (G,?) be a group and H G. Prove that if G/H is a p-group and is a p-group then is a p-group H.
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Groups and p-groups are investigated. The solution is detailed and well presented. The response received a rating of "5" from the student who originally posted the question.