The subgroups of Z under addition are the groups nZ under addition for n. True or False then why

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter3: Groups
Section3.3: Subgroups
Problem 8E: Find a subset of Z that is closed under addition but is not subgroup of the additive group Z.
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The subgroups of Z under addition are the groups nZ under addition for n. True or False then why

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