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*** at top-level: sumformal(1/n) *** ^-------------- *** sumformal: incorrect type in sumformal [not a t_POL] (t_RFRAC). 0 x 1/2*n^2 + 1/2*n 1/3*n^3 + 1/2*n^2 + 1/6*n 1/2*y*x^2 + (1/2*y + 1)*x (1/2*y^2 + 1/2*y)*x + y Total time spent: 4