GMAT Probability: Number of Distributions x Probability per Distribution

GMAT Probability and Number of Distributions x Probability per Distribution The Independent Probability Case for GMAT Probability Now, let’s go back to the example from the previous page, which we can rephrase as this:If a coin is flipped five times, what is the Probability that it will land on Heads only once?That gives us a … Read More

How to Understand GMAT Factorials

How to Understand GMAT Factorials — the Three-Question Method If we don’t get the concept of Factorials straight, the rest of this–Permutations and Combinations, quite a lot of advanced GMAT fatoring, etc.–is never going to work. How to Think About GMAT Factorials in a Broad Sense The idea of a Factorial is best described as … Read More

How to Analyze GMAT Quant Questions Properly PART II

CONSISTENTLY ASK YOURSELF: “Am I spinning my wheels?” Remember, that means doing things that won’t get you to the answer any faster. Are you calculating something that won’t yield one of the five answer choices? That’s not to say that the GMAT is giving you wrong information, but rather that the answer choices restrict your … Read More

How to Analyze GMAT Quant Questions PROPERLY

Arithmetic–or calculation for calculation’s sake–is a waste of time on GMAT Quant Questions. ​ There–I said it. Allow me to add a premise to my argument: insecurity plays a huge role in GMAT Quant Questions. Chew on that for a moment, and let this sink in: Already the human computer is widely displaced by mechanical … Read More

GMAT Combinatorics: Simple Guide to GMAT Permutations and Combinations

Introduction At the risk of blowing all the secrets too early, let’s do this at the beginning. If you can answer three Core Questions, you’ll be able to answer any Combinatorics question that the GMAT decides to throw at you. Here they are: How Many Spaces? How Many Choices? Does Order Matter? Figuring out the … Read More

The Ultimate Guide to GMAT Mixtures Questions — what fraction of this year’s graduating students at a certain college are males and more!

The Ultimate Guide to GMAT Mixtures Questions The beauty of Mixtures questions is that they are relatively simple once we get a couple of simple concepts straight. One nice thing about Mixture questions is that they are best learned through example, so let’s jump right in.  Let’s take a hypothetical case where we have a … Read More

The Basic GMAT Probability Equations — A Short Guide

The Basic GMAT Probability Equations First, we need to establish some sort of general definition for the term Probability itself. You’ll most often hear Probability defined as some variant of: desired outcomes / total outcomes First things first: Probability is always a fraction, which, of course, could also be a percent (because these two statements, … Read More