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Is (0,3,6,9....) closed under addition
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Is (0,3,6,9....) closed under addition

User Danijoo
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what do you mean by closed under addition? 0 +3=3 +3=6 +3=9... i think you would just add three each time, so if im not thinking incorrectly, i would say yes

User Dan Wolchonok
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