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Curated by: Khan Academy India - English (21 videos)
We now turn our attention towards rearranging letters. We use whatever we've learnt from the world of digits to solve problems involving a brand new context. We start by rearranging the letters of the word LOVE and then keep on adding constraints - first that the words start with a vowel and then that the words start and end with vowels. We practice this skill on another word NATURE - first creating a 6 lettered word and then creating a 3 lettered word. 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 the word LOVE) 00:52 Solution (repetition is not allowed) 01:23 Problem 2 (words start with a vowel) 01:50 Solution (dealing with constraint first) 02:18 Problem 3 (words start and end with vowels) 02:37 Solution (dealing with both constraints first) 03:27 Problem 4 (rearrange with word NATURE) 03:51 Solution (dealing with constraints first) 04:29 Problem 5 (3 letter word from NATURE) 04:50 Solution (dealing with constraints first) 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