The largest number of key comparisons made by binary search in searching for a key in an array is log2(n), where n is the size of the array.
What is an array?
An array is a data structure in computer science that consists of a collection of elements (values or variables), each of which is identified by at least one array index or key. A mathematical method is used to compute the position of each element from its index tuple in an array. A linear array, often known as a one-dimensional array, is the most basic sort of data structure. Arrays are among the oldest and most significant data structures, and practically every application makes use of them.
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