27020
27020 (Gheorghe Szöllösy)
Să se calculeze suma Failed to parse (syntax error): {\displaystyle \sum_{k=0}^\left[\frac{n}{2}\right] \left\dfrac{1}{4^k \cdot (k!)^2(n-2k)!}\right, n \geq 1 }
27020 (Gheorghe Szöllösy)
Să se calculeze suma Failed to parse (syntax error): {\displaystyle \sum_{k=0}^\left[\frac{n}{2}\right] \left\dfrac{1}{4^k \cdot (k!)^2(n-2k)!}\right, n \geq 1 }