Tìm số nguyên dương n thỏa mãn
$\frac{1}{2}C_{n}^{0}-\frac{1}{3}C_{n}^{1}+\frac{1}{4}C_{n}^{2}-...+\frac{(-1)^n}{2}C_{n}^{n}=\frac{1}{156}$
#1
Posted 01-04-2014 - 19:15
faraanh
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Thượng sĩ
thinking about all thing what you say but do not saying all thing what you think
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