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Which equations show that the set of whole numbers is closed under addition?

Choose all answers that are correct.
A.
0 + (–1) = –1
B.
1 + 1 = 2
C.
2 + 0 = 2
D.
2 + (–1) = 1

1 Answer

4 votes
B. 1 + 1 = 2
C. 2 + 0 = 2
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