Here are the answer and explanation to yesterday’s practice question. Thanks for submitting all of your answers!
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Combinations Practice Question of the Week #27
For this week’s practice question, there’s only one correct answer. Good luck, we’ll be posting the answer and explanation tomorrow! In how many ways can Ann, Bob, Chuck, Don and Ed be seated in a row such that Ann and Bob are not seated next to each other? 24 48 56 72 96 Update: Here’s [...]
Real-Life GRE Math: Foosball Combinations
Who says math doesn’t relate to real life? Here is a question that came up in our office just the other day: An office comprised of eight employees is planning to have a foosball game. A matchup consists of four players, split into pairs. If any employee can be paired up with any other employee, [...]
Combinations and Permutations Practice Questions and Video Explanations
As a continuation of my introduction to Combinations and Permutations, here are some practice problems to test the strategies I demonstrated. Also, I am trying out a new format. Instead of giving you practice problems and then writing out a half-page description for each one, I am simply going to give you the questions. But don’t [...]
GRE Math: Combinations and Permutations
If there is one type of problem that people almost universally revile, it is combinations and permutations. I have a couple of theories for this unfavorable response. First off, most of us do not learn how to do this in school. Or, if we did, it was only a basic lesson in a high school [...]
GRE Combinations and Non-combinations Part II
As I stated in my last post, the Fundamental Counting Principle (FCP) can be used to solve the majority of counting questions on the GRE. The FCP says: If we have a task consisting of stages, where one stage can be accomplished in A ways, another stage in B ways, another in C ways . [...]
GRE Combinations and…Non-combinations
Whenever I see a GRE resource label its counting section as “Combinations and Permutations,” a small part of me dies a little. Okay, that’s an exaggeration, but I am concerned about the misleading message that this sort of title conveys. To me, it suggests that counting questions can be solved using either permutations or combinations, [...]
Permutations and Combinations: Practice Question of the Week #13 Answer
The answer to this week’s question: The correct answer is A. Video Explanation: If you’d like more practice questions and video explanations, sign up for a Magoosh subscription. We’re having a 25% off sale that ends on the 31st!
Permutations and Combinations: Practice Question of the Week #13
Here’s this week’s question– we’ll be posting up the answer tomorrow, good luck! In how many different ways can 3 identical green shirts and 3 identical red shirts be distributed among 6 children such that each child receives a shirt? 20 40 216 720 729 Update: Here’s the answer/explanation post!
Combinations: Practice Question of the Week #5 Answer!
Combinations: In how many ways can 16 different gifts be divided among four children such that each child receives exactly four gifts? A. B. C. D. E. The answer is C. This one was tricky– hopefully the video will help you out if you didn’t get the answer right away. Let us know if there’s [...]
