b3=18; b6=-16/3
q^3=-16/3/18=-8/27
q=-2/3
b3=b1 * q^2
b1= b3/q^2
b1=18/(-2/3)^2=81/2
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b3=18; b6=-16/3
q^3=-16/3/18=-8/27
q=-2/3
b3=b1 * q^2
b1= b3/q^2
b1=18/(-2/3)^2=81/2