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

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Is it B and C

Yes

But this does not actually show it, it just suggest it might be true...

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