If the sequence of operations −$-$ push (1),$(1),$ push (2),$(2),$ pop, push (1),$(1),$ push (2),$(2),$ pop, pop, pop, push (2),$(2),$ pop are performed on a stack, the sequence of popped out values.....

Your answer:

2,1,2,2,1$2,1,2,2,1$

2,2,1,2,2$2,2,1,2,2$

2,1,2,2,2$2,1,2,2,2$

2,2,1,1,2$2,2,1,1,2$