Examine the convergence of the series : (i) 1+x 00 1+ x3 (а + 1) (2а + 1) , (а + 1) (2а + 1) (За + 1) (b + 1) (2b + 1)' (b + 1) (2b + 1) (3b + 1) ... 1 +x2 a + 1 (ii) 1 + 6 + 1

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