This series is designed to help you step up your Data Sufficiency practice while we all spend a little extra time at home during the coronavirus situation; I’m going to publish one practice Data Sufficiency question each day! You can choose to do all of them, or none of them.
Click on the tag “Social Distancing DS Challenge” at the bottom of this post to see all of the questions in this series!
And remember to take whatever precautions you need to stay healthy over the next few weeks!
If n is an integer, is n – 1 even?
(1) n – 2 is odd
(2) n + 1 is even
If n – 2 is odd, then we know that n itself must be odd. Not sure about that? Make up some numbers and test it out. So if n is odd, then n – 1 must be even. Statement (1) is sufficient.
Statement (2) tells us that n + 1 is even. That means that n is odd, which means that n – 1 is also even. Statement (2) is also sufficient! The correct answer is (D).