Probably for the same reason as maxima, the singularity n=1/2 inside the summation domain, if you start at 1 the answer is correct. Now fixed in geogebra svn and in xcas offline http://www-fourier.ujf-grenoble.fr/%7eparisse/xcasen.html#+normal(sum(1/((n+1)*(2*n-1)),n,0,inf)&
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