December 2018 1 80 Report
Dany jest ciąg:

t_n= \frac{n(n+1)}{2} \to n=0,1,2...

Wykaż, że:

a) S_n=t_0+t_1+t_2+...+t_n= \frac{n(n+1)(n+2)}{3!}
b) \Sigma_{k=0}^n\frac{k(k+1)(k+2)}{3!} =\frac{n(n+1)(n+2)(n+3)}{4!}
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