= 3. (10 points) Use set builder notation to describe these sets. a) Si = {1,2,4,8,16,...} b) S2 = {2,5,8, 11, 14,...} c) S3 = {1,4,9,16,25,...} d) S4 = {a,b,c, d, e, f,..., z} e) S5 = {a,e,i,o,u