b1=-2
b2=2*bn=2*(-2)=-4
q=-4/-2=2
S7=(b1*(q^n -1))/(q-1) = (-2*(2^7 -1))/(2-1) = -254
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b1=-2
b2=2*bn=2*(-2)=-4
q=-4/-2=2
S7=(b1*(q^n -1))/(q-1) = (-2*(2^7 -1))/(2-1) = -254