16. Determine the convergence or divergence of the sequence with the given ath term. a) an = n += b) an = 3n-4 27-1 For problems 17 -21, determine whether the series is convergent or divergent. Name the test you used to determine convergence or divergence. 17. Zn=1 Vna 18. 5.co (-1)" (n+1) 12-3 19. En=1 cos () co n'+5 20. 2n=1 n