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Magoosh Brain Twister: Sidesplitting Fun
This is a really tricky one, and it’s Numeric Entry. I’m wondering, can at least three people answer this correctly, making sure to provide a quick explanation. You’ll have till Thursday. Polygon X...
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Magoosh Brain Twister: Sidesplitting Fun – Explanation
Refresh your memory, then let’s get started on this week’s Brain Twister explanation! Question Polygon X has r sides, and each vertex has an angle measure of s, an integer. If Polygon Q has r/4 sides,...
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Magoosh Brain Twister: Flipping Out
Welcome back, brave Magooshers! 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)...
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Magoosh 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)...
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Magoosh Brain Twister: Variable Cloudiness
It’s Brain Twister week again! Get ready to train your brain. If a – j are distinct positive integers, what is the units digit of the lowest possible value of a^b x c^d x e^f x g^h x i^j? (A) 0 (B)...
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Magoosh Brain Twister: Variable Cloudiness – Answer and Explanation
Take a moment to refresh your memory, then jump into the explanation. Question If a – j are distinct positive integers, what is the units digit of the lowest possible value of a^b x c^d x e^f x g^h...
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Magoosh Brain Twister: Factorial Fun
Ready to twist your brain? Check out this week’s numeric entry challenge: How many positive values of x exist if n is a positive integer and 10 < x < 100? n = [x! – (x – 2)!]/(x – 1)! Numeric...
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Magoosh Brain Twister: Factorial Fun – Explanation
Welcome back! If you haven’t tried your luck with this week’s brain twister (or if you need a refresher), head back to the original post before checking out the answer. No cheating! Question How...
View ArticleFAQ: Should I Study Probability?
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....
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GRE Quantitative Comparison Geometry Practice Problems
Here is a batch of 7 practice QC questions. Explanations will come at the end of the article. 1) In the diagram, AC = 6. CE = 12, DF = 4, and AB is parallel to DE. 2) 3) In the diagram, JL = 4 and JK...
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Magoosh Brain Twister: Siding with the Polygon
Let’s jump right in to the brain twisting fun: In regular Polygon Q the ratio of the length of the longest line that can be drawn between two vertices to the length of any one side is greater than 2....
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Magoosh Brain Twister: Siding with the Polygon – Explanation
Welcome back! Today, we finally answer Tuesday’s Brain Twister challenge: Question In regular Polygon Q the ratio of the length of the longest line that can be drawn between two vertices to the...
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Magoosh Brain Twister: Going Through a Phrase
Let the brain twisting commence! A “phrase” is made up of the first seven letters of the alphabet so that each letter appears exactly once. The “phrase” must contain at least two “words”, which must...
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Magoosh Brain Twister: Going Through a Phrase – Explanation
Welcome back! If you haven’t had a chance to try your hand at this week’s Brain Twister, head back to the original post so you don’t accidentally see the answer here. Question A “phrase” is made up...
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Magoosh Brain Twister: A Known Unknown
Twist your brain with this challenging GRE problem! Then, leave a comment with your work and best guess. Good luck! x^n + x^n + x^n = x^(n + 1) Which of the following must be true? I. n = 2 II. x...
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Magoosh Brain Twister: A Known Unknown – Explanation
Welcome back! Today, we’ll go over Tuesday’s Brain Twister problem. Question x^n + x^n + x^n = x^(n + 1), where x cannot equal zero. Which of the following must be true? I. n = 2 II. x = 3 III....
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How to Round to the Nearest Integer | GRE Math
What does it mean to round a number? Rounding means to make a number shorter or simpler, but keeping it as close in value as possible to the original number. Let’s take a closer look: Rounding to the...
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GRE Math: What’s the Difference Between Combination and Permutation?
Do you know the difference between permutation and combination? No? You’re not alone. Combinations and permutations are the bane of many students. Yet, what I’ve noticed over the years is it’s not so...
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GRE Math Formula eBook
Based on your suggestions, our third Magoosh GRE eBook is a compilation of must-know GRE math formulas for you to reference and memorize as you study! Though memorizing a math formula (or twelve)...
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GRE Geometry Formulas
Perhaps you recall with more than a little dread your high school geometry class: fifteen-step proofs and the law of cosines were two things you were certain you’d never see again. Well, if you are...
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