a)
Sn=(2n+1)²=4n²+4n+1
i teraz podstawiasz do wzoru
b)
Sn=n(n+1)=n²+n
c)
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a)
Sn=(2n+1)²=4n²+4n+1
i teraz podstawiasz do wzoru
b)
Sn=n(n+1)=n²+n
c)