If ab>1 then which of the following MUST be less than one?
(A)-a
(B)-b
(C)(a+1)(b+1)
(D)(a-1)(b-1)
(E)(ab)^-1
The answer is E. From the question, just divide both sides by ab and since ab is +ve there is no need to flip the sign...Only one scenario to be considered.
1>1/(ab)
1>(ab)^-1
However, I was hoping to get some help in eliminating the other answer choices because I want to improve on my math skills. And sometimes the correct answer may not be so obvious. Detailed explanations would be appreciated. Thanks
(A)-a
(B)-b
(C)(a+1)(b+1)
(D)(a-1)(b-1)
(E)(ab)^-1
The answer is E. From the question, just divide both sides by ab and since ab is +ve there is no need to flip the sign...Only one scenario to be considered.
1>1/(ab)
1>(ab)^-1
However, I was hoping to get some help in eliminating the other answer choices because I want to improve on my math skills. And sometimes the correct answer may not be so obvious. Detailed explanations would be appreciated. Thanks
