Determine the convergence or divergence of the series. oo 20) a) > 2k-1/3 b) E C) k=1 k=1 Vk20 5 k=1 K14 Use the Comparison Test to determine if the series converges or diverges. sin n cos n Oo oo 21) a) _ b) E 9 cos n 4n n=1 n3 c) E n=1 n=1 4n-1 + 1 6 d) E e) E 6 5n + 4Vn n=1 n=1 7Vn + 4Vn