6 P x 2 x 7 write all the elements in set P 7 Q x 2 x 7 write all the elements in set Q 8 Is set P equivalence to set Q 9 R 1 2 3 4 5 6 and S 2 4 6 is set S a subset of set R 10 From question number 9 is set R a subset of set S 11 Write an example of a null or empty set 12 What is a proper subset and give an example of a proper subset