If integers a and b are distinct factors of 30, which of the foll

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If integers a and b are distinct factors of 30, which of the following CANNOT be a factor of 30? I. ab + b2 II. (a + b)2 III. a + b

A、I only
B、II only
C、III only
D、 I and II only
E、I, II, and III

答案：B

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