21. What is the depth of Node F in the given K-ary tree?

22. Who invented k-d trees?
23. Who is the ancestor of Node H?

24. What is the upper bound for maximum leaves in K-ary tree with height h?
25. What is the size of the given K-ary tree?

26. Can child node be always called Leaf node in the ternary tree?
27. Which nodes are the siblings of Node B of given ternary tree?

28. Insertion into a 2-d tree is a trivial extension of insertion into a binary search tree.
29. Is Node A sibling of Node D in the given ternary tree?

30. Which of the following expression can be represented by the given syntax tree?

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