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stonecold
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stonecold
If A is the factor of B and B is the factor of A then which of the following must be true?

A) A=B
B) A=-B
C) A=1
D) A=B or A=-B
E) A=0 or B=0

Aside: This question is centered around the notion that the factors of an integer can be either positive of negative.
For example, the factors of 6 are: {1, 2, 3, 6, -1, -2, -3, and -6}
While this is true, the GMAT typically restricts the discussion of factors to positive factors only.
Note: I want to say "always" here. I've certainly never seen an official GMAT question that doesn't restrict the discussion to positive factors.

Cheers,
Brent

Hi Brent,

If we have to consider only the positive factors then I guess it has to A = B. Can you please give the details on this.

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