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a₁=0,01
an=1
n=?
an=a₁+(n-1)r
r(n-1)=an-a₁
n-1=(an-a₁)/r
n=(an-a₁)/r+1
n=(1-0,01)/0,01+1
n=0,99/0,01+1
n=99+1
n=100
Sn=(0,01+1)*100/2
Sn=1,01*50
Sn=50,5
a1 = 0,01
n = 100
r = 0,01
a100 = 1
S 100 = ( a1 + a100) * 100/2
S100 = (0.01 + 1 )* 100/2
S100 = 1,01 * 50
S100 = 50,5