From the course: Preparing for the GMAT
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Combinations
- So for combination questions, unlike permutation questions the order of things does not matter. In this video, we'll look at a combination question, talk about how to solve them, and talk about how to tell them apart from permutation questions. So let's start with the key words to look for. In a question to signify that you might be dealing with a combination. You might see the key words, "groups," or "sets," So it might ask you, "how many groups of three can we make of a group of eight?" Or, "How many different sets of five can we make from a set of eight things?" When we're talking about a group or set, we typically don't care about the way it's ordered unless we specifically hear "arrangements," or "ways." So let's just pretend, let's say we have a baseball team. Baseball team puts nine players on the field at a time, if you didn't know that, and let's say the team decides to go to a square dance together. Right, so how many groups of two can we make from the nine players so weâ¦
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Contents
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GMAT Quantitative overview1m 40s
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Data sufficiency basics2m 53s
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Data sufficiency testing numbers5m 43s
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Elimination technique2m 14s
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Estimation technique3m 41s
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Backsolving technique4m 57s
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Translation technique3m 5s
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Adding numbers technique3m 35s
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Variables in choices technique5m 37s
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Integers: Factors, multiples, and remainders3m
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Integers: Even, odd, and primes5m 9s
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Order of operations2m 26s
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Number properties3m 23s
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Fraction basics4m 33s
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Adding and subtracting fractions3m 48s
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Multiplying and dividing fractions1m 25s
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Decimals4m 53s
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Mental percents3m 48s
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Taking percents and increasing by percents2m 58s
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Percent change3m 7s
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Ratios and proportions4m 36s
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Exponent rules2m 34s
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Fake exponent rules2m 47s
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Roots5m
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Scientific notation5m
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Multiplying expressions2m 28s
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Linear equations1m 45s
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Linear equations with two variables5m 9s
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Quadratic identities2m 17s
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Quadratic equations3m 22s
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Linear inequalities1m 46s
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Absolute value inequalities3m 6s
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Functions4m 26s
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Function graphs2m 10s
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Coordinate geometry1m 59s
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Distance between points3m 52s
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Equation of a line6m 37s
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Solving incomplete points and equations2m 17s
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Parabolas3m 1s
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Sequences2m 26s
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Point, lines, segments, and planes52s
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Angles1m 42s
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Parallel lines1m 57s
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Polygons3m 5s
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Triangles3m 35s
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Pythagorean theorem2m 37s
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Special right triangles3m 12s
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Area of a triangle2m 3s
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Congruent triangles1m 49s
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Similar triangles2m 30s
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Quadrilaterals2m 15s
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Circles2m 35s
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Circle proportions3m 31s
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Boxes and cylinders5m 43s
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Introduction3m 31s
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Reading critically4m 11s
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Basic question technique3m 22s
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Answer choice traps4m 30s
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Primary purpose questions2m 50s
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Main idea questions3m 35s
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Detail questions4m 41s
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Critical reasoning questions1m 31s
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Function questions1m 55s
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Analogy questions3m 24s
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Critical reasoning basics3m 4s
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Strengthen the argument3m 55s
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Weaken the argument2m 39s
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Find the assumption2m 44s
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Draw a conclusion3m 5s
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Resolve the paradox2m 36s
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Bolded phrases questions4m 28s
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Find the flaw2m 56s
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Evaluate the conclusion3m 3s
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Sentence correction basics1m 14s
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Sentence correction technique5m 22s
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Sentence components2m 45s
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Agreement2m 58s
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Sentence fitness3m 14s
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Modification2m 30s
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Word pairs and parallelism2m 46s
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Comparisons1m 25s
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Verb tense1m 13s
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Diction and idiom1m 39s
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