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:

Optimistic

Having a positive or hopeful attitude towards the future, often with a confidence in successful outcomes.

Adverse Effects

Unintended, negative outcomes resulting from a medical treatment, medication, or intervention.

Stress

A biological and psychological response experienced on encountering a threat that we feel we do not have the resources to deal with.

Religious Involvement

The extent of an individual's participation in activities and rituals of a religious community, reflecting beliefs, practices, and a sense of belonging to a faith group.