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      Question

      A queue initially empty undergoes the following sequence

      of operations: 1.  enqueue(10) 2.  enqueue(20) 3.  dequeue() 4.  enqueue(30) 5.  dequeue() 6.  enqueue(40) What is the final state of the queue (elements from front to rear)?
      A [10, 20, 30, 40] Correct Answer Incorrect Answer
      B [30, 40] Correct Answer Incorrect Answer
      C [40] Correct Answer Incorrect Answer
      D [10, 40] Correct Answer Incorrect Answer
      E [20, 30, 40] Correct Answer Incorrect Answer

      Solution

      (1. [10] 2. [10, 20] 3. [20] (10 dequeued) 4. [20, 30] 5. [30] (20 dequeued) 6. [30, 40])

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