Combinatorics - Permutation and Combination Formulas
Angles & Arguments » Combinatorics
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1y ago
A recurring question from many students who are preparing for GMAT is this: When should one use the permutation formula and when should one use the combination formula ..read more
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Combinatorics - Basic Counting Principle for Linear Arrangements
Angles & Arguments » Combinatorics
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1y ago
In how many ways can 3 people sit on 3 adjacent seats of the front row of the theatre? In how many ways can 6 people sit on 6 adjacent seats of the front row of the theatre if two of them, A and B, ca ..read more
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Combinatorics - What is the Basic Counting Principle?
Angles & Arguments » Combinatorics
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1y ago
The first thing we want to discuss in Combinatorics is something called the “Basic Counting Principle” because it is useful in almost all medium level questions of this topic and i ..read more
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Combinatorics - Sum on Three Dice Part I
Angles & Arguments » Combinatorics
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1y ago
Today we will discuss why ‘understanding’ rather than just ‘learning’ a concept is important. Most questions can be solved using different methods. Sometimes, a particular method seems really easy ..read more
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Combinatorics - When Does Order Matter?
Angles & Arguments » Combinatorics
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1y ago
I have to admit that probability is confusing. The problem is not so much that students find it hard to understand as that instructors find it hard to explain. There are subtle points in a probability ..read more
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Combinatorics - Linear Arrangements with Symmetry
Angles & Arguments » Combinatorics
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1y ago
Today, I want to discuss the symmetry principle of linear arrangements with you. If you do not understand the symmetry principle, then it is possible that the following has happened with you ..read more
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Combinatorics - Distributing Paintings Between Collectors
Angles & Arguments » Combinatorics
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1y ago
Sometimes, you come across some seriously interesting questions in Combinatorics. For example, this question I came across seemed like any other Combinatorics question, though it was a little cumberso ..read more
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Combinatorics - Visual Symmetry in GMAT Probability
Angles & Arguments » Combinatorics
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1y ago
Today, let’s take a look at an official GMAT question involving visual skills. It takes a moment to understand the given diagram, but at close inspection, we’ll find that this question is just a simpl ..read more
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