Let X={1,{1},{1,2},2,{3},4}, Which statements are true? (a) 2X (b) {2}x (c) {2}X (d) 3X (e) {1,2}X (f) {1,2}x (g) {2,4}x (h) {2,4}X (i) {2,3}x (j) {2,3}X (k) X=7 Exercise 3.22 Write out a power set in roster notation. Write the power set of each set in roster notation. (a) (a) (b) {1,2}