Re: If ab > 0, then which one of the following must be true? (A)
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23 Apr 2022, 17:43
if ab > 0, then a and b must have same sign. Either both positive or both negative integers
(A) a/b > 0 => whether a and b are both positive or both negative integers, both will result in values > 0
(B) a – b > 0 => if a and b are both negative integers for example a = -2 and b = -1, a - b = -2 - (-1) = -1, it cannot be greater than 0
(C) a + b > 0 => if a and b are both negative integers, it can never be greater than 0
(D) b–a > 0 => if a and b are both positive integers for example b = 1 and a = 2, b - a = 1 - 2 = -1, it cannot be greater than 0
(E) a + b < 0, if a and b are both positive integers, it can never be less than 0
Correct Answer: A