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In a Stack the command to access nth element from the top of the stacks will be

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1.
Consider the usual algorithm for determining whether a sequence of parentheses is balanced.
Suppose that you run the algorithm on a sequence that contains 2 left parentheses and 3 right parentheses (in some order).

The maximum number of parentheses that appear on the stack AT ANY ONE TIME during the computation?
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2.
Consider the usual algorithm for determining whether a sequence of parentheses is balanced.The maximum number of parentheses that appear on the stack AT ANY ONE TIME when the algorithm analyzes: (()(())(())) are:
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3.
To implement a stack using queue(with only enqueue and dequeue operations), how many queues will you need?
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4.
A stack works on the principle of____________.
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5.
Stack is also called as
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