Combination as a Selection

This video aims to aid the conceptual understanding of the following concepts: 1) Meaning of a combination 2) Definition of a combination 3) Combination as a selection 4) Theorem on number of selections of r objects out of n objects 5) Meaning of nCr 6) Pascal's number 7) Meaning of C(n, r) 8) nCr = nCr-1 9) nC0 = nCn = 1 10) Relation between nCr and nPr 11) nCr + nC(r-1) = (n + 1)Cr 12) Properties given by Pascal, Newton 13) r(nCr) = (n) . (n-1) C(r-1) 14) Greatest value of nCr 15) Property of combination by Van Der Mond 16) Number of line segments formed out of n distinct points 17) Number of diagonals of n sided polygon 18) Number of straight lines by joining n points of which m are collinear Check out Target's Brand Store at Amazon : https://amzn.to/2BXHRNJ 📕 JEE (Main) Challenger Maths Vol. - 1 https://bit.ly/2CmTJJG 📕 JEE (Main) Challenger Maths Vol. - 2 https://bit.ly/2NLXEBR Connect with us on our socials: Subscribe: https://www.youtube.com/c/TargetPublicationsYT Website: https://www.targetpublications.org/ Instagram: https://www.instagram.com/targetpublications/ Facebook: https://www.facebook.com/targetpublications/ _________________________ Target Publications is a long-standing educational content publishing enterprise that has remained an indispensable part of the Indian education industry for over 18 years. With 900+ titles to our name, our portfolio consists of an array of books ranging from children books, schools books, college books, books for competitive exams and stationery.