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plot {1.7^{n-2}+1.7^{n-1} , 1.7^n , (1.7^n-1)/0.7 } for n =3 ...20
plot {1.7^{n-2}+1.7^{n-1} , 1.7^n , (1.7^n-1)/0.7 } for n =3 ...20
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