Feb 3 · 9 min read · What is a Derangement? A derangement is a permutation where no element appears in its original position.It is often referred to as the "no fixed point permutation." For example, in the word "ABC", the total permutations are : ABC ✗ (All are in its o...
Join discussion
Dec 21, 2019 · 11 min read · By Neil Kakkar Here's the short version. Let's take ringing bells in a church as an example. A permutation is an ordering of the bells. You're figuring out the best order to ring them in. A combination is the choice of bells. You're choosing the bel...
Join discussion
Mar 28, 2017 · 19 min read · By Peter Gleeson Take a look at the image below. It’s a collection of bugs and creepy-crawlies of different shapes and sizes. Take a moment to categorize them by similarity into a number of groups. This isn’t a trick question. Start with grouping the...
Join discussion