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d=a2-a1=8 a4^2=a2*a3 (a1+3d)^2=(a1+d)(a1+2d) a1^2+6d*a1+9d^2=a1^2+3d*a1+2d^2 a1=-7d/3=-56/3 an=a1+(n-1)d =-56/3+8(n-1) =8n-80/3
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