Please show me how to start these

1-38 Test the series for convergence or divergence. 2- 1 19. > (-1)" In n 1. n - 1 n=in' + 1 2. n=in'+ 1 n=1 Vn 20. Vk - 1 k=1 k(Vk + 1) 3. C (-1)" n' - 1 4. E (-1 )an - 1 (-1)" cos(12) 22. 2 1 1=1 n' + 1 n=1 n- + k_1 2 + sin k 5. > 1 = 1 6. n2n 23. > tan(1) n=1 24. > n sin(1) 8 7 (1 +n) 3n n=1 25. 26. T n2+ 1 7. > n=2 nvInn 8. > (-1)7-12 5" n= 1 4" n=1 en2 1=1 9. E (-1)" TT 2n 10. ne-13 27. 8 k In k p 1 (2n)! k=1 (k + 1)3 28. > 1=0 1=1 12 n=1 11. 29. 8 (-1)" 3 + 3 " 12. n=1 cosh n 30. > (-1) n=1 K=1 kk2 + 1 j=1 j + 5 13. iM s 3" n2 14. sin 2n 31. 5 k (n!)" n! *=1 3* + 4k 32. 4n n=1 n=1 1 + 2' 1=1 15. 2k-13k+1 n 16. Vn* + 1 33. > 18 n=1 n +1 34. k =1 kk n=1 n' + n n=in + ncos'n 17. 1 . 3 . 5 . . . . . (2n - 1) 35. 8 2 36. 1 1=1 2 . 5 . 8 . . . . . (3n - 1) n=In +1 n=2 (In n) Inn 18. 18 (-1)"-1 37. _ (1/2 - 1)" n=1 38. > W/2 - 1) 1=1