42) The series 12-a converges if and only if aja>1 b)a 1 for all n e N. b) converges by the Ratio Test. c) diverges by the Limit Comparison Test with by = _. d) None of the above. 45) E(-1)"+(vn+1 - vn) #=1 a) converges absolutely. b) converges conditionally. c) diverges. d) None of the above.46) If _ an converges, then n=1 a) Z converges. n=1 b) lim an = 0. n-00 c) _ (an) converges. n=1 d) _ cos(an) converges. n=1 e) _ cos(an) dinverges. n=1