February 2019 0 49 Report
Zapisz w prostej postaci liczbę:
\mathrm{a)}\ \sum\limits^n\limits_{k=0}\dbinom{n}{k}3^k\\\\  \mathrm{b)}\ \sum\limits^n\limits_{k=0}\dbinom{n}{k}(-2)^k

Odpowiedzi:
a) 4ⁿ
b) (–1)ⁿ
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