Share: Title:PERMUTATIONS & COMBINATIONS : Show that [n! : r!(n-r)!} + [n! : (n-r)!(n-r+1)!] = (n+1)! : r!(n-r+1) Duration: 4:54 Plays: 8 views Published: 4 days ago Download MP3 Download MP4 Simillar Videos ▶️ 4:12 Permutations & Combinations : Simplify : [ (n^2-9) : (n+3)! ] + [ 6 : (n+2)! ] - [ 3 : (n+1)! ] 8 views • 3 days ago ▶️ 5:41 Sequences & Series : Find Sn For The G.p. 0.4 + 0.44 + 0.444 + ... 8 views • 2 weeks ago ▶️ 7:01 Permutations & Combinations :show That (2n)!:n! = 2^n (2n-1)(2n-3)...5.3.1 8 views • 4 days ago ▶️ 4:27 Permutations & Combinations : Simplify : [(n+2):n!] - [(3n+1):(n+1)!] 8 views • 3 days ago