Suppose that H is a proper subgroup of ? under addition and H contains 18, 30, and 40. Determine H.
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Step 1: Recall that \( \mathbb{Z} \) under addition is the set of all integers, and a subgroup of \( \mathbb{Z} \) under addition is also a set of integers that is closed under addition and contains the additive identity (0). Show more…
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