6. Express the following sets using the roster method. (Express the elements as strings, not as...

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6. Express the following sets using the roster method. (Express the elements as strings, not as n-tuples.) (a) {1x1 : x = {0, 1}} (b) {0, 1} U {0, 1} (c) {xy : x = {1}U {1} and y = {a,b}} 6. Express the following sets using the roster method. (Express the elements as strings, not as n-tuples.) (a) {1x1 : x = {0, 1}} (b) {0, 1} U {0, 1} (c) {xy : x = {1}U {1} and y = {a,b}}