1) a) is 5={5} b) How many elements are in the set {3,4,5,6} c) How many elements are in the set {1.{1}.{1,{1}}} ? d) Is {0}{{0},{1}} 2) Let A={w,x,y,z} and B={a,b}. Use the set=roster notation to write each of the following sets, and indicate the number of elements in each set. a) AB b) BA c) AA d) BA 3) Let A={c,d,f,g},B={f,j}, and C={d,g}. Answer the following questions/ a) Is BA ? b) Is CA ? c) Is CC ? d) Is C a proper subset of A ? 4) Let T={x,y}. List all the strings of length 5 over T 1) a) is 5={5} b) How many elements are in the set {3,4,5,6} c) How many elements are in the set {1.{1}.{1,{1}}} ? d) Is {0}{{0},{1}} 2) Let A={w,x,y,z} and B={a,b}. Use the set=roster notation to write each of the following sets, and indicate the number of elements in each set. a) AB b) BA c) AA d) BA 3) Let A={c,d,f,g},B={f,j}, and C={d,g}. Answer the following questions/ a) Is BA ? b) Is CA ? c) Is CC ? d) Is C a proper subset of A ? 4) Let T={x,y}. List all the strings of length 5 over T