On Sunday, May 1, 2016 at 1:14:47 AM UTC+2, Marc Tardif wrote:
>
> The expression does not evaluate numerically in Maxima either:
>
> (%i11) sum((3^(x-1)-1)/6^(x-1),x,1,inf), simpsum;
If you're only interested in the numbers you can also use Pari:
sage: pari("suminf(x=1,(3^(x-1)-1)/6^(x-1))")
0.800000000000000
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