Combination Formula nCr and Properties | JEE 2027 Maths (English)

Free notes + solved JEE problems for this lesson: https://rankdeterminant.com/go/yt-mat... All lessons of this unit:    • JEE 2027 Maths | Unit 4 Permutations and C...   What a combination is and why nCr = nPr / r!: selections where order does not matter, the n!/(r!(n-r)!) formula, the properties nCr = nC(n-r), a particular object always included or excluded, nCr + nC(r-1) = (n+1)Cr, and the sum 2^n, the order-matters trap, and two solved JEE-style problems: committees and handshakes, and a cricket XI. Chapters 0:00 Introduction 0:34 Combination: a selection, order does not matter 1:46 The formula for nCr 2:18 Property 1: take r, or leave n-r 2:49 More properties 4:07 The trap: first ask, does order matter? 4:51 Example 1: committee of 4 from 9, and 12-person handshakes 6:01 Example 2: cricket XI, one player included or excluded 7:23 Quick revision: nCr formula, properties, does order matter A free JEE paper every day and a full JEE Main mock every Sunday: https://rankdeterminant.com/go/yt-dai... Mathematics · Unit 4 · Permutations & Combinations · Chapter 3 · Combinations #Combinations #JEEMaths #JEE2027 Narrated with a computer voice.