Question

1. C₂¹¹ = C₉¹¹
2. C₅¹⁵ = C₁₀¹⁵
Jawab yaa pake cara

Answer 1

11C2            = 11C9
11! / ( 9!.2!) = 11! / (9!.2!)
55                 = 55

15C5             = 15C10
15! / (10!.5!) = 15! / (10!.5!)
231                = 231