https://www.khanacademy.org/math/ka-math-class-11/x0419e5b3b578592a:sets-ncert-new/x0419e5b3b578592a:sets-and-their-representations/v/roster-and-set-builder-form 2025-03-01T15:52:37.13987578Z Roster and Set-builder form This video showcases two ways of representing sets. Roster method (which is when we write down the answers) and Set - builder method (which is when we simply pose the questions). We understand the notations for both the methods and look at a number of examples. Ashish Gupta video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Roster and Set-builder form This video showcases two ways of representing sets. Roster method (which is when we write down the answers) and Set - builder method (which is when we simply pose the questions). We understand the notations for both the methods and look at a number of examples. https://cdn.kastatic.org/ka-youtube-converted/sMgy1FC8OFY.mp4/sMgy1FC8OFY.mp4 432 Sets https://www.khanacademy.org/math/ka-math-class-11/x0419e5b3b578592a:sets-ncert-new/x0419e5b3b578592a:sets-and-their-representations/v/worked-example-set-builder-to-roster-form 2025-03-01T15:52:37.13987578Z Worked example - Set builder to Roster form We practice converting sets from Set builder to Roster form in this video. This means that we'll be given some math questions and we'll be writing down the answers for each. Just that we'll be speaking the language of sets this time. Ashish Gupta video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Worked example - Set builder to Roster form We practice converting sets from Set builder to Roster form in this video. This means that we'll be given some math questions and we'll be writing down the answers for each. Just that we'll be speaking the language of sets this time. https://cdn.kastatic.org/ka-youtube-converted/Oxp18iHF_Dk.mp4/Oxp18iHF_Dk.mp4 271 Sets https://www.khanacademy.org/math/ka-math-class-11/x0419e5b3b578592a:sets-ncert-new/x0419e5b3b578592a:sets-and-their-representations/v/empty-finite-and-infinite-sets 2025-03-01T15:52:37.13987578Z Empty, Finite, and Infinite sets Can we classify sets based on the number of elements they have? Definitely! In this video, we'll categorise sets into three buckets - Empty sets, Finite sets, and Infinite sets. We'll also look at a number of examples. Ashish Gupta video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Empty, Finite, and Infinite sets Can we classify sets based on the number of elements they have? Definitely! In this video, we'll categorise sets into three buckets - Empty sets, Finite sets, and Infinite sets. We'll also look at a number of examples. https://cdn.kastatic.org/ka-youtube-converted/y9jsodWD5fc.mp4/y9jsodWD5fc.mp4 309 Sets https://www.khanacademy.org/math/ka-math-class-11/x0419e5b3b578592a:sets-ncert-new/x0419e5b3b578592a:untitled-1198/v/subset-strict-subset-and-superset-indian-accent 2025-06-04T10:04:13.13703146Z Subset, strict subset, and superset A subset of a set A is any set B such that every element of B is also an element of A. A strict subset is a subset that isn't equal to the original set (i.e. B must have at least one fewer element than A). A superset of A is any set C such that A is a subset of C. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Subset, strict subset, and superset A subset of a set A is any set B such that every element of B is also an element of A. A strict subset is a subset that isn't equal to the original set (i.e. B must have at least one fewer element than A). A superset of A is any set C such that A is a subset of C. https://cdn.kastatic.org/ka-youtube-converted/q1ZYS0iE7Cw.mp4/q1ZYS0iE7Cw.mp4 242 Sets https://www.khanacademy.org/math/ka-math-class-11/x0419e5b3b578592a:sets-ncert-new/x0419e5b3b578592a:sets-and-their-representations/v/equal-sets 2025-03-01T15:52:37.13987578Z Equal sets Are sets ever equal? What makes them equal? Turns out if they have the exact same elements, two sets can be considered equal. It is much more convenient to compare sets in their roster forms than set-builder forms. Let's have a closer look at equal sets through some examples. Ashish Gupta video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Equal sets Are sets ever equal? What makes them equal? Turns out if they have the exact same elements, two sets can be considered equal. It is much more convenient to compare sets in their roster forms than set-builder forms. Let's have a closer look at equal sets through some examples. https://cdn.kastatic.org/ka-youtube-converted/SURbSnPYzgs.mp4/SURbSnPYzgs.mp4 416 Sets https://www.khanacademy.org/math/ka-math-class-11/x0419e5b3b578592a:sets-ncert-new/x0419e5b3b578592a:untitled-1203/v/universal-set-and-absolute-complement-indian-accent 2025-06-04T10:04:13.13703146Z Universal set and absolute complement Lets understand more challenging set ideas and notation like the universal set and absolute complement. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Universal set and absolute complement Lets understand more challenging set ideas and notation like the universal set and absolute complement. https://cdn.kastatic.org/ka-youtube-converted/eFGKbjJxwPg.mp4/eFGKbjJxwPg.mp4 350 Sets https://www.khanacademy.org/math/ka-math-class-11/x0419e5b3b578592a:sets-ncert-new/x0419e5b3b578592a:untitled-1203/v/intersection-and-union-of-sets-indian-accent 2025-06-04T10:04:13.13703146Z Intersection and union of sets To find the intersection of two or more sets, you look for elements that are contained in all of the sets. To find the union of two or more sets, you combine all the elements from each set together, making sure to remove any duplicates. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Intersection and union of sets To find the intersection of two or more sets, you look for elements that are contained in all of the sets. To find the union of two or more sets, you combine all the elements from each set together, making sure to remove any duplicates. https://cdn.kastatic.org/ka-youtube-converted/u36t9ofHJ2k.mp4/u36t9ofHJ2k.mp4 409 Sets https://www.khanacademy.org/math/ka-math-class-11/x0419e5b3b578592a:sets-ncert-new/x0419e5b3b578592a:untitled-1203/v/properties-of-union-of-sets 2025-03-01T15:52:37.13987578Z Properties of Union of sets In this video, we'll look at a few properties of Union of sets. We'll visualise them using Venn diagrams to get a better intuition. Key properties discussed include - Commutative law, Associative law, Law of identity element, Idempotent law, and Law of U. Ashish Gupta video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Properties of Union of sets In this video, we'll look at a few properties of Union of sets. We'll visualise them using Venn diagrams to get a better intuition. Key properties discussed include - Commutative law, Associative law, Law of identity element, Idempotent law, and Law of U. https://cdn.kastatic.org/ka-youtube-converted/V8Vsvz24sv0.mp4/V8Vsvz24sv0.mp4 243 Sets https://www.khanacademy.org/math/revision-mh-math-class-9/x6ee29cf0de77cbed:week-1/x6ee29cf0de77cbed:sets/e/revision-sets-mh-class-9 2026-02-03T09:22:16.808346173Z Revision Sets MH class 9 . Khan Academy exercise