Ile wynosi suma liczb 1+2+3+...+49+50??
Tylko nie liczyć na kalkulatorze! lecz sprytnie :)
r=1
a50=50
a1=1
Sn=(a1+an)/2*n=(1+50)*50/2=1275
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r=1
a50=50
a1=1
Sn=(a1+an)/2*n=(1+50)*50/2=1275