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Lính mới
Edited by Mai Duc Khai, 02-12-2012 - 21:18.
Binh nhì
Edited by Mai Duc Khai, 02-12-2012 - 21:15.
Sĩ quan
Với n, k $\epsilon$ N* chứng minh rằng:$C_{n}^{k} + 2C_{k}^{k-1}+ C_{n}^{k-2} = C_{n+2}^{k}$ với $2 \leq k\leq n$MOD: Chú ý Tiêu đề@@
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