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Which traversal of a binary search tree gives elements in sorted order?

  • A.Preorder
  • B.Postorder
  • C.Inorder
  • D.Level order

Answer: C

The traversal is inorder.

In a BST every key in the left subtree is smaller than the node and every key in the right subtree is larger. Inorder traversal visits left subtree, node, right subtree, so it lists the keys in ascending order.

Preorder visits the node before its subtrees and postorder after them, so neither gives sorted output. Level order lists the tree level by level from the root, which is not sorted either.

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