The very tricky and very nefarious "must be true" question type can foil the best math minds. Without practice, prep, and a good strategy, you might find yourself wasting a lot of time on these questions.

Today I'll cover a useful strategy for these questions and work through a problem in the Official Guide to the GMAT-question 32. And if you need even more tips, I recommend reading this article on our blog.

https://magoosh.com/gmat/2015/gmat-tuesd ... questions/