Let a Be the Set of All Strings of Decimal

question 46

Short Answer

Let A be the set of all strings of decimal digits of length 5. For example 00312 and 19483 are two strings in
A.
You pick a string from A at random. What is the probability that
(a) the string begins with 7575.
(b) the string has no 4 in it.
In questions 13-16 you have 40 different books (20 math books, 15 history books, and 5 geography books).

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Definitions:

Natural Science

Refers to the systematic empirical inquiry into the causal explanations for the observed patterns, structures, and functions of natural phenomena from the subatomic to the galactic in scope.

Encryption

The process of converting data or information into code to prevent unauthorized access.

Lottery Servers

Computer systems or hardware that manage and operate lottery games, ensuring secure and fair drawing of winners.

Empirical Research

The study and collection of data through direct and indirect observation or experience.