Combinatorics

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 simple probability question – the trick […]

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 cumbersome. But when I saw the answer, it got me thinking – […]

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: You see a hard question and start working […]

Today’s Undertaking: Let’s refer back to the last post on Combinatorics. We discussed why it is important to fully understand what you are doing and why you are doing it, especially while using an innovative method. We talked about it […]

Today’s Undertaking: 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 and quick and we tend to ‘learn’ it without […]

Today’s Undertaking: Using the basic counting principle we can solve many simple questions. We will look at some types of questions below. Simple Linear Arrangement Question 1: In how many ways can 3 people sit on 3 adjacent seats of […]