Stacks and Queues

4. Which of the following data structures works on the principle of 'First In, First Out' (FIFO)?
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1. What are the strategies/principles used in Stacks and Queues?
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2. How many pointers are used for reference in Stacks and Queues?
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3. How many queues are needed to implement a stack? (Assume no other data structure like arrays or linked list is available.)

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