Answer :
The postorder traversal of the elements are 12, 21, 92, 45, 4, 3.
Postorder traversal is one of the traversing techniques used to visit the node withinside the tree. It is primarily based totally on the precept LRN (Left-proper-node). Postorder traversal has a feature to get the postfix expression of a tree.
We can print postorder traversal without creating the tree. The idea is, the root is constantly the primary object in preorder traversal and it needs to be the remaining object in the postorder traversal. We first recursively print the left subtree, then recursively print the proper subtree. Finally, print root.
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