Is the set of multiples of 5 closed under division? Explain why or provide a counterexample if not.
A.
Yes, because the quotient of any two multiples of 5 is also a multiple of 5.
B.
Yes, because the quotient of any two multiples of 5 is also a multiple of 10.
C.
No, and a counterexample is 100 ÷ 5 = 20.
D.
No, and a counterexample is 25 ÷ 50 = .

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@Kitten_is_back start with the counter examples: do they disprove what's being said?

okay

d

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