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r=16/32
r=0,5
a= 32
S12=a(r^n-1)/r-1
32(0,5^12 - 1)/-0,5
S12= 63,98438
b.
r= 1/9 x 3
r= 1/3
a= 1/3
S12= a(r^n-1)/r-1
1/3(1/3^12 - 1)/1/3 -1
S12= 0,499
S₁₂ =