https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:prob-comb/x9e81a4f98389efdf:combinatorics-precalc/v/permutation-formula 2023-07-14T23:21:51.065682509Z Permutation formula Want to learn about the permutation formula and how to apply it to tricky problems? Explore this useful technique by solving seating arrangement problems with factorial notation and a general formula. This video also demonstrates the benefits of deductive reasoning over memorization. video https://cdn.kastatic.org/googleusercontent/YI2u-e551gtcv7AJIReC8wx32uHpSIN3Wpc5DdHE5pA-iey00u2qCoX4dyiBul3n05JJTsOGodG3bfy81wAEaTFRQQ Permutation formula Want to learn about the permutation formula and how to apply it to tricky problems? Explore this useful technique by solving seating arrangement problems with factorial notation and a general formula. This video also demonstrates the benefits of deductive reasoning over memorization. https://cdn.kastatic.org/ka-youtube-converted/DROZVHObeko.mp4/DROZVHObeko.mp4 455 Permutaciones https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:prob-comb/x9e81a4f98389efdf:combinatorics-precalc/v/zero-factorial-or-0 2023-07-14T23:21:51.065682509Z Zero factorial or 0! Learn all about factorials! Factorials are a quick way to represent multiplying a number by all the smaller positive integers down to one. This video also shows why mathematicians have defined zero factorial as one, instead of zero, to make the formula for permutations work in all cases. video https://cdn.kastatic.org/googleusercontent/551b4yt_sMgyYwGuhp8J9GEQX44ijXOkRY982HD7c9PGl290XYqR9G8Tvns3jvxSW_ATwi1k_XsB9sAfWcXI9JV7 Zero factorial or 0! Learn all about factorials! Factorials are a quick way to represent multiplying a number by all the smaller positive integers down to one. This video also shows why mathematicians have defined zero factorial as one, instead of zero, to make the formula for permutations work in all cases. https://cdn.kastatic.org/ka-youtube-converted/HGoZfzz6dU0.mp4/HGoZfzz6dU0.mp4 290 Permutaciones https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:prob-comb/x9e81a4f98389efdf:combinatorics-precalc/v/factorial-and-counting-seat-arrangements 2023-07-14T23:21:51.065682509Z Factorial and counting seat arrangements Learn how to use permutations to solve problems involving ways to arrange things. Permutations involve using factorials to count all possible arrangements. This video also explores examples including arranging three people in three seats and five people in five seats. video https://cdn.kastatic.org/ka_thumbnails_cache/0774f97b-0792-49da-b8c6-ff23347f5db8_1280_720_base.png Factorial and counting seat arrangements Learn how to use permutations to solve problems involving ways to arrange things. Permutations involve using factorials to count all possible arrangements. This video also explores examples including arranging three people in three seats and five people in five seats. https://cdn.kastatic.org/ka-youtube-converted/eoxbgUIYhHo.mp4/eoxbgUIYhHo.mp4 333 Permutaciones https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:prob-comb/x9e81a4f98389efdf:combinatorics-precalc/v/possible-three-letter-words 2021-07-01T17:39:46Z Possible three letter words Sal explains how to find all of the possible three letter words when we can use each letter as many times as we want, and when each letter can only be used once. video https://cdn.kastatic.org/googleusercontent/ESP366P6i3NNbLTFEqf1v4ibDJJIlsZ57prwMW9lVbXMUGOsYCrvNT-YksIFmbcbZJuxLJikw0g4zTf5YYlgUQo Possible three letter words Sal explains how to find all of the possible three letter words when we can use each letter as many times as we want, and when each letter can only be used once. https://cdn.kastatic.org/ka-youtube-converted/VYbqG2NuOo8.mp4/VYbqG2NuOo8.mp4 339 Permutaciones https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:prob-comb/x9e81a4f98389efdf:combinatorics-precalc/v/permutations-and-combinations-1 2021-07-01T17:39:51Z Ways to arrange colors Thinking about how many ways you can pick four colors from a group of 6 Sal Khan video https://cdn.kastatic.org/googleusercontent/L9bqo-HYdFDVwlERLP4mEZlCfJq_PsJSEWWNDejf8pC8bTON5nZf53UmAohI_zb-zpJfAZCk-Cm_VDKwMi6hI5M Ways to arrange colors Thinking about how many ways you can pick four colors from a group of 6 https://cdn.kastatic.org/ka-youtube-converted/oQpKtm5TtxU.mp4/oQpKtm5TtxU.mp4 225 Permutaciones https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:prob-comb/x9e81a4f98389efdf:combinatorics-precalc/v/permutations-and-combinations-2 2021-07-01T17:39:51Z Ways to pick officers How many ways can we pick officers for our organization? Sal Khan video https://cdn.kastatic.org/googleusercontent/_Envat47KoVSql1K2ngT64pgsf367ENom3xPrLrpR9D1lRsKhMrJ99gehpcH2vlK8vYqUlL0X05lHpPwyQlx58NP Ways to pick officers How many ways can we pick officers for our organization? https://cdn.kastatic.org/ka-youtube-converted/v9NLtiVt3XY.mp4/v9NLtiVt3XY.mp4 139 Permutaciones https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:prob-comb/x9e81a4f98389efdf:combinatorics-precalc/e/permutations_1 2026-03-26T15:40:48.884321068Z Permutations Use permutations to count how many ways you can arrange k objects from n total objects when order matters. Mark Wittels exercise