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NIELIT 2017 OCT Scientific Assistant A (CS) - Section B: 5

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A binary search tree contains the values-$1,2,3,4,5,6,7$ and $8.$ The tree is traversed in preorder and the values are printed out. Which of the following sequences is a valid output?

  1. $5\;\;3\;\;1\;\;2\;\;4\;\;7\;\;8\;\;6\;\;$
  2. $5\;\;3\;\;1\;\;2\;\;6\;\;4\;\;9\;\;7$
  3. $5\;\;3\;\;2\;\;4\;\;1\;\;6\;\;7\;\;8$
  4. $5\;\;3\;\;1\;\;2\;\;4\;\;7\;\;6\;\;8$
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