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What is the space complexity of the in-order traversal in the recursive fashion? (d is the tree depth and n is the number of nodes)

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What does the below definations convey?i. A binary tree is balanced if for every node it is gonna hold that the number of inner nodes in the left subtree and the number of inner nodes in the right subtree differ by at most 1.ii. A binary tree is balanced if for any two leaves the difference of the depth is at most 1.
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The number of edges from the root to the node is called __________ of the tree.
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In how many different ways can a tree be traversed?
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Consider below sequences:

array=60 90 10 100 40 150 90

reverse 2 to 3

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now printout from 1 to 6 :-- 60 100 150 40 100 90

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