NET SLET Computer Science PAPER November 2017

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question #25

25. Postorder traversal of a given binary search tree T produces following sequence of keys : 3, 5, 7, 9, 4, 17, 16, 20, 18, 15, 14 Which one of the following sequences of keys can be the result of an in-order traversal of the tree T ?

(A) 3, 4, 5, 7, 9, 14, 20, 18, 17, 16, 15

(B) 20, 18, 17, 16, 15, 14, 3, 4, 5, 7, 9

(C) 20, 18, 17, 16, 15, 14, 9, 7, 5, 4, 3

(D) 3, 4, 5, 7, 9, 14, 15, 16, 17, 18, 20

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NET Paper 2 - Computer Science- November 2017

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