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Curated by: Khan Academy India - English (21 videos)
In this video, we solve four equations involving permutations and combinations. For the first one, we apply the result we observed in the previous video - combination of r objects is same as that of n-r objects. For the remaining three, we plug in the formulae for ncr and npr and solve for the missing variable. 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/permutations_and_combinations_2) Timestamps: 0:00 Finding n given nc8 = nc2 2:25 Finding n given the ratio of two combinations 3:50Finding n given the ratio of two permutations 4:40 Finding r given the relation between two permutations 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