41. What type of tree is used in databases for indexing?
42. What is the primary use of a Trie data structure?
43. In a B-Tree, what is the minimum number of keys in a non-root node?
44. What is the primary benefit of using a B+ Tree over a B-Tree?
45. Which property is maintained in a Red-Black Tree to ensure balanced height?
46. Who is the ancestor of Node G?

47. Bigger the query rectangle the better is the query efficiency.
48. Consider the given syntax tree. Assume that division has the lowest precedence than addition, subtraction and multiplication. Addition and subtraction have the same precedence but more than multiplication. Which of the following expression can be given by the following syntax tree?

49. What is the depth of the root node of K-ary tree?
50. In an expression tree algorithm, what happens when an operand is encountered?
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