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In a binary search tree, which of the following traversals would print the numbers in the ascending order?

(a) Level-order traversal

(b) Pre-order traversal

(c) Post-order traversal

(d) In-order traversal

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Right choice is (d) In-order traversal

The best I can explain: In a binary search tree, a node’s left child is always lesser than the node and right child is greater than the node, hence an in-order traversal would print them in a non decreasing fashion.

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