b1=9,b2=-3
q= -3/9=-1/3
S= b1/(1-q)=9/(1-(-1/3))= 9/(4/3)=27/4=6,75
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b1=9,b2=-3
q= -3/9=-1/3
S= b1/(1-q)=9/(1-(-1/3))= 9/(4/3)=27/4=6,75