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Curated by: Khan Academy India - English (21 videos)
In this video, we look at an interesting way to find the number of selections from a given set of distinct objects. We use the word NATURE as an example. We know how to find the ways to form a given lettered word. But we break this process down into its two parts - selecting and arranging. We divide the total number of words by the number of ways of arranging letters to get the number of ways of selecting. 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-908/e/combinations_1) Timestamps: 0:00 Two letter words using the letters of the word NATURE 1:20 Solving for the number of ways to select the two letters 3:20 Listing down all combinations and arrangements 4:25 Ways to select 3 letters from the word NATURE 5:20 Ways to select 4 letters from the word NATURE 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