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a1=2001
a31=2031
Sn=(a1+an)*n/2
S31=(2001+2031)*31/2 =4032*31/2 =2016*31
2016*31/31=2016 otrzymal
2000*31=62000
1+2+3+4+5+6+7+8+9+10+11+...+31=496
62000+496=62496