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do wzoru zamiast n wstaw 1
a1=35*1-12=23
a18=35*18-12=618
do wzoru zamiast n wstaw 18
masz wzór na sumę;
Sn= [ a1 +an] /2 *n
n=18
an= a18
S18=[23+618] /2*18
S18=641*9=5769