I have 30 days to the test and am terrified about probability…what should I do? There is perhaps no other topic on the GRE math that instills as much dread in students as does probability. Understandably, students will obsess over this topic more than they will other topics. However, such an approach won’t only lead […]

# Archive | Probability

## Clemmonsdogpark Brain Twister: Flipping Out – Explanation

Make sure you remember this week’s question before moving on to the explanation. Question If a fair coin is tossed six times, what is the probability of getting exactly three heads in a row? (A) 1/16 (B) 3/16 (C) 1/8 (D) 3/8 (E) 1/2 Answer and Explanation A good way to think about […]

## Clemmonsdogpark Brain Twister: Flipping Out

Welcome back, brave Clemmonsdogparkers! Best of luck with this week’s diabolical GRE Brain Twister. 🙂 If a fair coin is tossed six times, what is the probability of getting exactly three heads in a row? (A) 1/16 (B) 3/16 (C) 1/8 (C) 3/8 (D) 1/2 See you on Thursday for the answer and […]

## Clemmonsdogpark Brain Twister – Probability with a High Chance of Turbulence

There’s nothing like a mathematical Brain Twister to put you in the holiday spirit … right? 🙂 Let’s get started… Melilla, Tasha, and Chester plan to fly on a jetliner that has seven seats per row. The middle row consists of three seats, which are separated on each side by an aisle and two […]

## How Many Probability Questions are on the GRE?

There are few concepts on the GRE that frighten students more than that of probability. Many go out of their way to study difficult probability questions, agonizing over concepts that are beyond the scope of the GRE. Test day, though, you might only see one probability question. You will probably see two, though you might […]

## GRE Math Multi-subject Challenge Question

Once in a while it is fun to take a concept in an official GRE question and run with it. The question below is inspired by a question from the 2nd edition Official Guide. That is not to say it is that similar; I have only extracted a couple of concepts from that problem. I’ve […]

## Breakdown of the Most Commonly Tested GRE Quant Concepts

The 2nd edition Official Guide has just been released. At the back of the book is a new test (GRE Practice Test 2). In general, the concept break down is not surprising, if you look at the concepts that pop up in Practice Test 1 (which is the same as the practice test in the […]

## GRE Counting and Probability: Practice Question of the Week #39 Answer

Here’s the answer to yesterday’s practice question— thanks for sending in all of your answers and explanations!

## GRE Counting and Probability: Practice Question of the Week #39

Here’s this week’s practice question– good luck, we’ll be posting the answer tomorrow! How many integers between and are such that the sum of their digits is ? 190 210 211 230 231 Update: Answer/explanation post!

## GRE Probability: Practice Question of the Week #33 Answer

Here are the answer and explanations to yesterday’s practice question, thanks for sending in all of your answers! Explanation Video Explanation