27020: Difference between revisions
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'''Soluție:''' | '''Soluție:''' | ||
Fie <math> a_n </math> coeficientul lui <math> X^ | |||
Fie <math> a_n </math> coeficientul lui <math> X^n </math> din rezolvarea lui | |||
Revision as of 17:12, 18 October 2023
27020 (Gheorghe Szöllösy)
Să se calculeze suma Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \sum_{k=0}^{\left\lfloor\frac{n}{2}\right\rfloor} \frac{1}{4^k \cdot (k!)^2 \cdot (n-2k)!}, \quad n \geq 1 }
Soluție:
Fie Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle a_n } coeficientul lui Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle X^n } din rezolvarea lui