When Probability Meets Combinatorics: One Problem, Two Approaches

When Probability Meets Combinatorics: One Problem, Two Approaches

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...
Independent vs. Dependent Probability

Independent vs. Dependent Probability

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....
GMAT How-to: Probability Problems

GMAT How-to: Probability Problems

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...