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love_love_love1995
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Chứng minh rằng :
[TEX]C^0_n.C^k_n- C^1_n.C^{k-1}_{n-1} + C^2_n.C^{k-2}_{n-2}-....+(-1)^k.C^k_n.C^{n-k}_0=0[/TEX]
[TEX]C^0_n.C^k_n- C^1_n.C^{k-1}_{n-1} + C^2_n.C^{k-2}_{n-2}-....+(-1)^k.C^k_n.C^{n-k}_0=0[/TEX]