By: Apex GMAT Contributor: Ilia Dobrev Date: August 12, 2021 The concept of probability questions is often pretty straightforward to understand, but when it comes to its application in the GMAT test it may trip even the strongest mathematicians. Naturally, the place...

By: Rich Zwelling, Apex GMAT Instructor Date: 16th March, 2021 Now, we’d like to take a look at an Official GMAT Probability problem to pull everything together. The following is a good example for two reasons: 1. It illustrates a quirky case that is difficult more...

By: Rich Zwelling, Apex GMAT Instructor Date: 11th March, 2021 In our last post, we discussed a solution for the following question, which is a twist on an Official Guide GMAT probability problem: Xavier, Yvonne, and Zelda individual probabilities for success on a...

By: Rich Zwelling, Apex GMAT Instructor Date: 8th March, 2021 Independent vs. Dependent Probability As promised last time, we’ll return to some strict GMAT probability today. Specifically, we’ll discuss the difference between independent and dependent probability....

As promised in the last post, today we’ll discuss what happens when we have a PERMUTATIONS situation with repeat elements. What does this mean exactly? Well, let’s return to the basic example in our intro post on GMAT combinatorics: If we have five distinct paintings,...

GMAT probability questions, which test logical reasoning skills, tend to be quite daunting. The good news is that they don’t appear very frequently; the Quant section contains no more than three or four probability questions. However, since so many test-takers...