Examine each of the following series for convergence and, if necessary, decide whether there is absolute convergence. Give reasons for your answers. (You do not have to specify the values of the convergent series.)

DO 4+3n 2 (a) n 2n+1 n=1 (c) n! 2n+1)n n=0 37 (b) (n+1)2n 7=0 (d) > (-1)" 3n-2 n=1