Starting with an empty stack, the sequence of operations push(1), push(2), pop(), push(5), leaves the stack, from top to bottom, as:
1, 2
5, 2
2, 5
5, 1

The correct option is: 5, 1.

To understand the sequence of operations and resulting stack, let's go through the steps one by one:

Starting with an empty stack: The stack is empty, and we haven't added any elements yet.

push(1): The push operation adds an element to the top of the stack. In this case, we add the number 1 to the stack, so the stack becomes [1].

push(2): We perform another push operation, this time adding the number 2 to the top of the stack. So, the stack becomes [1, 2].

pop(): The pop operation removes the top element from the stack. In this case, the top element is 2, so we remove it from the stack. The resulting stack is [1].

push(5): We add the number 5 to the top of the stack using the push operation, so the stack becomes [1, 5].

Final stack: At this point, we have completed all the operations. The resulting stack, from top to bottom, is 5 at the top and 1 at the bottom.

In summary, the sequence of operations push(1), push(2), pop(), push(5) leaves the stack with the elements 5 at the top and 1 at the bottom.

Know more about the pop operation click here:

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