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y= x + 13 + x + 23 + x + 33 + ... + x + 1.003
n=(1003-13+10)/10=1000/10=100
S100=100/2(13+1003)=50(1016)=50800
Y=nx+S100=100x+50800
2). Pola 1,3,6,10,...
Pola segitiga Un=½n(n+1)
U10=½.10(10+1)=5(11)=55
U100=½.100(100+1)=50(101)=5050
3).
r=1/6 ÷ 1/2=2/6=⅓
Un=ar^(n-1)
Un=a(⅓^n-1)
U4=½(⅓^4-1)=½(⅓³)=½.(1/27)=1/54