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The number of digits is an example of combination, and Olive has 40,000 possible codes that begin with a prime number.What is combinations?A combination is a mathematical technique for determining the number of possible arrangements in a set of items where the order of the selection is irrelevant. You can choose the items in any order in combinations. Permutations and combinations are often confused.The parameters are as follows:Prime number = first digit (2, 3, 5, and 7)This indicates the first digit could be any of the four prime numbers, and the remaining four digits could be any of the ten digits 0 - 9.As a result, the number of codes is :Code = 4 * 10 * 10 * 10 * 10By evaluating,Codes = 40,000As a result, Olive has 40,000 possible codes that begin with a prime number.To learn more about combinations refer to :https://brainly.com/question/4658834#SPJ4