Is the set of numbers that can be written as the product of 6 and an integer closed under subtraction?
A.
Yes, because the difference of any two multiples of 6 is equal to 6.
B.
Yes, because the difference of any two multiples of 6 is also a multiple of 6.
C.
No, and a counterexample is 6 – 6 = 0.
D.
No, and a counterexample is 6 – 18 = –12.

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