Factorials Demystified

gmat gre Dec 12, 2018
 

What are factorials?

Factorials are among the more advanced math topics you'll be expected to know on the GMAT or GRE, especially if you're shooting for a high score. They most commonly come up in what I call "counting" questions (the "how many ways...?" questions that involve combinations and permutations), but you may see factorials tested individually as well.

You recognize a factorial by the exclamation point "!" after a number, and that mathematical notation simply tells you to multiply every integer in decreasing order starting with the number before the exclamation point and stopping at one (1). 

For example, 8! (read "eight factorial") = 8x7x6x5x4x3x2x1 = 40,320.

Advanced Factorial Example + Strategy

As you can see, factorials can get pretty big! And in fact, you very rarely actually need to multiply out all of the numbers to solve problems involving factorials on your exam. The numbers can get too large for the built-in calculator on the GRE, and you don't even have...

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3 ways to get a higher score with less study time

gmat gre lsat sat Oct 25, 2018
 

You've no doubt heard the adage that "practice makes perfect." But that's not necessarily true. I prefer the legendary American football coach Vince Lombardi's variation that goes, "Perfect practice makes perfect."

You see, how you practice and prepare for your exam matters. I want to shed some light on that for you so that you're able to maximize your study time. In fact, if you internalize and take action on the three tips I'm going to share with you, you'll be able to get more right answers on test day without having to put in a lot of extra hours. Time is valuable, so why spend more of it preparing for your exam than absolutely necessary?

Okay, let's dive in.

A Tale of Two Candidates

Consider the following two hypothetical students studying for their respective exams.

Candidate A: Studies for 100 hours.

Candidate B: Studies for 80 hours.

Which student do you think is likely to get a higher score?

It's a trick question. On the surface, it seems like Candidate A is the obvious...

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GRE Bootcamp - Register Now! (Sept. 22-23, 2018)

gre Sep 14, 2018

Texas A&M University - Central Texas has teamed up with Dominate Test Prep to offer an intensive, one-weekend online "bootcamp" course for the GRE September 22-23, 2018.

If your preparation for the GRE could use a pick-me-up -- or if you simply need to get up to speed on the GRE quickly -- then you need to make this class a priority.

During this content-packed workshop we will:

  • Review the highest-yielding content areas for GRE quant, verbal, and AWA
  • Introduce three of the most important non-standard math strategies to help you get more right answers without using the traditional algebra
  • Give you a step-by-step methodology for tackling each of the major question types on the GRE
  • Teach you how to get right answers on Sentence Completion questions even if you don't know what certain words mean
  • Discuss proper time management and introduce crucial time-saving techniques
  • Make sure you master the three major approaches for Quantitative Comparisons
  • Learn how to read passages...
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GRE Probability Workshop (July 24, 2018)

gre webinars Jul 20, 2018

Understanding probability isn't just important for improving your odds at the Blackjack table in Las Vegas. It's also important if you want a high GRE Quant score, as many of the more challenging questions you'll see on test day are probability-related.

Here's the good news. Almost every probability question you'll encounter on the GRE -- even the most advanced ones -- can be quickly solved using just a few key rules and strategies.

And here's the even better news. I'm going to teach them to you in the free workshop I'm hosting on Tuesday, July 24th at 8:30pm EST (5:30pm Pacific).

WHAT: Learn to Dominate Challenging GRE Probability Questions (Free Webinar)
DATE: Tuesday, July 24, 2018
TIME: 8:30pm Eastern Time U.S. (5:30pm Pacific)
WHO: Brett Ethridge, Lead GRE Instructor, Dominate Test Prep
Register: https://www.dominatetestprep.com/p/probability-webinar-gre-7-24-18

Specifically, here's what I'm going to be covering in this content-packed webinar:

  • Understanding the foundational...
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Reading Comprehension Webinar for GMAT & GRE (Dec. 12, 2017)

gmat gre webinars Dec 07, 2017

I have a confession to make.

But first, let me jump to the punchline. I'm excited to partner with standardized test prep expert Brandon Royal (author of Ace the GMAT and The Little Red Writing Book) to offer a free online class next Tuesday, December 12th on reading comprehension strategies for the GMAT and GRE.

Here are the details:

WHAT: Learn to Dominate GMAT/GRE Reading Comprehension Questions [Webinar]
GUEST TRAINER: Brandon Royal, author of Ace the GMAT and The Little Red Writing Book
DATE: Tuesday, December 12, 2017
TIME: 8:00pm Eastern Time U.S. (5:00pm Pacific)

To learn more and register, click HERE:

Okay, now back to my confession.

For years, I've told my students that reading comprehension is the hardest part of the verbal section to improve, especially for non-native English speakers. I mean, reading skills are developed over years, not months, right?

Not necessarily.

It all depends on how effectively reading comp is taught on the GMAT and GRE, and that's...

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