b2=-35q=b2/b1=-35/7=-5S4=b1*(1-q^4)/(1-q)S4=7*(1-625)/(1+5)=7*(-624)/6=7*(-104)=-728
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b1=7
b2=-35
q=b2/b1=-35/7=-5
S4=b1*(1-q^4)/(1-q)
S4=7*(1-625)/(1+5)=7*(-624)/6=7*(-104)=-728