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Curated by: Khan Academy India - English (21 videos)
In this video, we solve 3 problems of arranging distinct objects in a row given constraints on arrangements. We realise that it is better to split the tasks and tackle the ones that don't involve constraints first. We first solve for a scenario where boys and girls are seated in a row but no two boys sit together. In the second one, the girls are sitting in even places. For the last one, we arrange + and - signs such that no two - signs are 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-908/e/combinations_1) Timestamps: 0:00 Seating such that no two boys sit together 2:45 Seating such that girls sit in even places 4:00 Arranging such that no two negative signs are 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