Only solve #9, #13, #21

Using the Direct Comparison Test In Exercises 5-16, use the Direct Comparison Test to determine the convergence or divergence of the series. 5. 6. 1 = 1 2n - 1 3n2 + 2 1 An 7. 8. n =2 Vn - 1 50 + 3 M8 8 In n 9. 10. n' + 1 1 1 11. 12. i M8 n=on! 43 - 1 18 6" + n 13. iM8 14. 50 - 1 sinn cos n + 2 15. 16. iM8 1= 1 n- Vn Using the Limit Comparison Test In Exercises 17-26, use the Limit Comparison Test to determine the convergence or divergence of the series. 5 17. 18. n- + 1 4" + 1 2" + 1 19. 20. 1=0 2 + 1 n= 50 + 1 2n2 - 1 21. 22. iM8 3n + 2n + 1 n2 (n2 + 4) n 23. 24. n=Inn + 1 (n + 1)20-1 nk - 1 25. k > 2 26. sin - 1= n* + 1' n