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Curated by: Khan Academy India - English (21 videos)
We cover a tricky constraint in this video. How to rearrange letters of a word when a set of letters are always together. We learn how to bundle the group of letters that are constrained to always stick together. Once we've solved for the bundled group, we then figure out a systematic way to unbundle the group. We summarise the approach and then use it in another scenario where 3 vowels are constrained to be always together. We finish it off by discussing the case when the opposite is expected - that the vowels are never together. Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! (https://www.khanacademy.org/math/ncert-class-11/xea4762213f311c5e:permutations-and-combinations-ncert-new/xea4762213f311c5e:untitled-900/e/permutations_1) Timestamps: 00:00 Problem 1 (Rearrange BUNDLING such that vowels are always together) 00:58 Approach to solving bundling problems 01:36 Solving for the bundled group 03:05 Figuring out the unbundling 04:21 Summarising the approach 05:00 Problem 2 (Rearrange MATHISFUN such that all vowels are always together) 06:24 Problem 3 (Rearrange MATHISFUN such that all vowels are never together) Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Ashish Gupta