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Curated by: Khan Academy India - English (21 videos)
We've learnt how to rearrange MANGO. In this video, we'll find ways to rearrange APPLE. We take the example of LEAF and TREE to understand the concept. LEAF does not have repeating letters but TREE does. We figure out a way to efficiently find the number of duplicates and remove them. We use this skill for words where there are more than 2 letters repeating: ABC and AAA, FAFF etc. Finally, we summarise and try recognising the pattern that we can use for corrections in similar scenarios. 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 Rearranging the word LEAF 00:33 Rearranging the word TREE 01:52 Generating all possible arrangements for LEAF 02:24 Generating all possible arrangements for TREE 03:17 Finding and removing duplicates 04:11 Algorithm when repetition is involved 05:06 Rearranging MANGO and APPLE 05:55 Rearranging ABC and AAA 06:48 Rearranging the word FAFF 08:00 Recognising the pattern for corrections 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