(c) Prove that the intersection of any three subgroups is a subgroup while the union of two subgroups not be a subgroup. need

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A: The detailed solution of (a) is as follows below:

Q: Prove that the intersection of two subgroups of a group G is a subgroup of G.

A: We will prove the statement.

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A: Thanks for the question :)And your upvote will be really appreciable ;)

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