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).

---

Definitions:

DNA Fingerprinting

A technique used to identify individuals by characteristics of their DNA, often used in forensic science to match suspects with samples found at a crime scene.

Paternity Tests

Genetic tests that are used to determine whether a particular man is the biological father of a specific child.

Forensic Analysis

The scientific examination and evaluation of evidence from crime scenes and elsewhere for legal purposes.

Comparative Genomics

Study of genomes through the direct comparison of the genes and DNA sequences from multiple species.