Explanation Approach: Cryptography is the art of coding or decoding messages. Using cryptography, one can send secret messages to another person and no one else can read the message without the decoding key. The secret message is called cipher text. In simple codes, a letter is replaced with another letter or a number. In modular codes, the text messages are coded using modular arithmetic. In simple and modular codes, the inverse of encoding key is the decoding key and vice versa. Given Information: The message “MATHEMATICS IS FUN.” The letters in the English alphabets are coded from the numbers 1 to 26, comma (,) is coded as 27, period (.) is coded as 28 and space is coded as 29. Calculation: The following table illustrates the code for the English alphabets, comma, period and space. Letters Code Letters Code Letters Code Letters Code A 1 I 9 Q 17 Y 25 B 2 J 10 R 18 Z 26 C 3 K 11 S 19 Comma (,) 27

Nature of Mathematics (MindTap Course List)

13th Edition

ISBN: 9781133947257

Author: karl J. smith

Publisher: Cengage Learning

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Permutations and Combinations

If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba…

Counting Theory

The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.

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Chapter 5.8, Problem 6PS

To determine

To Encode:

The message “MATHEMATICS IS FUN.”

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Chapter 5.8, Problem 5PS

Chapter 5.8, Problem 7PS

Chapter 5 Solutions

Nature of Mathematics (MindTap Course List)

Ch. 5.1 - Level 1 IN YOUR OWN WORDS Explain each of the...Ch. 5.1 - Prob. 2PS Ch. 5.1 - Prob. 3PS Ch. 5.1 - Prob. 4PS Ch. 5.1 - Prob. 5PS Ch. 5.1 - Prob. 6PS Ch. 5.1 - Prob. 7PS Ch. 5.1 - Prob. 8PS Ch. 5.1 - Prob. 9PS Ch. 5.1 - Prob. 10PS

Ch. 5.1 - Prob. 11PS Ch. 5.1 - Prob. 12PS Ch. 5.1 - Prob. 13PS Ch. 5.1 - Prob. 14PS Ch. 5.1 - Prob. 15PS Ch. 5.1 - Prob. 16PS Ch. 5.1 - Prob. 17PS Ch. 5.1 - Prob. 18PS Ch. 5.1 - Prob. 19PS Ch. 5.1 - Prob. 20PS Ch. 5.1 - Prob. 21PS Ch. 5.1 - Level 1 In Problems 15-26, classify each as an...Ch. 5.1 - Prob. 23PS Ch. 5.1 - Prob. 24PS Ch. 5.1 - Prob. 25PS Ch. 5.1 - Prob. 26PS Ch. 5.1 - Prob. 27PS Ch. 5.1 - Prob. 28PS Ch. 5.1 - Prob. 29PS Ch. 5.1 - Level 1 Think of three nonassociative word triples...Ch. 5.1 - Prob. 31PS Ch. 5.1 - Prob. 32PS Ch. 5.1 - Prob. 33PS Ch. 5.1 - Prob. 34PS Ch. 5.1 - Prob. 35PS Ch. 5.1 - Prob. 36PS Ch. 5.1 - Prob. 37PS Ch. 5.1 - Prob. 38PS Ch. 5.1 - Prob. 39PS Ch. 5.1 - Prob. 40PS Ch. 5.1 - Prob. 41PS Ch. 5.1 - Prob. 42PS Ch. 5.1 - Prob. 43PS Ch. 5.1 - Prob. 44PS Ch. 5.1 - Prob. 45PS Ch. 5.1 - Prob. 46PS Ch. 5.1 - Prob. 47PS Ch. 5.1 - Prob. 48PS Ch. 5.1 - Prob. 49PS Ch. 5.1 - Prob. 50PS Ch. 5.1 - Prob. 51PS Ch. 5.1 - Prob. 52PS Ch. 5.1 - Prob. 53PS Ch. 5.1 - Prob. 54PS Ch. 5.1 - Prob. 55PS Ch. 5.1 - Problem Solving Level 3 Consider a soldier facing...Ch. 5.1 - Prob. 57PS Ch. 5.1 - Prob. 58PS Ch. 5.1 - Prob. 59PS Ch. 5.1 - Problem Solving Level 3 60. The Vanishing...Ch. 5.2 - IN YOUR OWN WORDS What is a prime number?Ch. 5.2 - Prob. 2PS Ch. 5.2 - Prob. 3PS Ch. 5.2 - Prob. 4PS Ch. 5.2 - Prob. 5PS Ch. 5.2 - Prob. 6PS Ch. 5.2 - Prob. 7PS Ch. 5.2 - Prob. 8PS Ch. 5.2 - Prob. 9PS Ch. 5.2 - Prob. 10PS Ch. 5.2 - Prob. 11PS Ch. 5.2 - Prob. 12PS Ch. 5.2 - Prob. 13PS Ch. 5.2 - Prob. 14PS Ch. 5.2 - Find all the prime numbers less than or equal to...Ch. 5.2 - Determine the largest prime you need to consider...Ch. 5.2 - Prob. 17PS Ch. 5.2 - Prob. 18PS Ch. 5.2 - Prob. 19PS Ch. 5.2 - Prob. 20PS Ch. 5.2 - Prob. 21PS Ch. 5.2 - Prob. 22PS Ch. 5.2 - Prob. 23PS Ch. 5.2 - Prob. 24PS Ch. 5.2 - Prob. 25PS Ch. 5.2 - Prob. 26PS Ch. 5.2 - Prob. 27PS Ch. 5.2 - Prob. 28PS Ch. 5.2 - Prob. 29PS Ch. 5.2 - Prob. 30PS Ch. 5.2 - Prob. 31PS Ch. 5.2 - Prob. 32PS Ch. 5.2 - Prob. 33PS Ch. 5.2 - Prob. 34PS Ch. 5.2 - Prob. 35PS Ch. 5.2 - Prob. 36PS Ch. 5.2 - Prob. 37PS Ch. 5.2 - Prob. 38PS Ch. 5.2 - Prob. 39PS Ch. 5.2 - Two movie theaters, UAI and UAII, start their...Ch. 5.2 - Prob. 41PS Ch. 5.2 - Shannon is planning a party and wants to give each...Ch. 5.2 - Boxes that are 12 inches tall are stacked next to...Ch. 5.2 - Hot dogs come in packages of 10, while buns come...Ch. 5.2 - IN YOUR OWN WORDS We used a sieve of Eratosthenes...Ch. 5.2 - Prob. 46PS Ch. 5.2 - Prob. 47PS Ch. 5.2 - Prob. 48PS Ch. 5.2 - Prob. 49PS Ch. 5.2 - Prob. 50PS Ch. 5.2 - Prob. 51PS Ch. 5.2 - Prob. 52PS Ch. 5.2 - Prob. 53PS Ch. 5.2 - Prob. 54PS Ch. 5.2 - Prob. 55PS Ch. 5.2 - What is the smallest natural number that is...Ch. 5.2 - Prob. 57PS Ch. 5.2 - Prob. 58PS Ch. 5.2 - Prob. 59PS Ch. 5.2 - Prob. 60PS Ch. 5.3 - Prob. 1PS Ch. 5.3 - Prob. 2PS Ch. 5.3 - Prob. 3PS Ch. 5.3 - Prob. 4PS Ch. 5.3 - Prob. 5PS Ch. 5.3 - Prob. 6PS Ch. 5.3 - Prob. 7PS Ch. 5.3 - Prob. 8PS Ch. 5.3 - Prob. 9PS Ch. 5.3 - Prob. 10PS Ch. 5.3 - Prob. 11PS Ch. 5.3 - Prob. 12PS Ch. 5.3 - Prob. 13PS Ch. 5.3 - Prob. 14PS Ch. 5.3 - Prob. 15PS Ch. 5.3 - Prob. 16PS Ch. 5.3 - Prob. 17PS Ch. 5.3 - Prob. 18PS Ch. 5.3 - Prob. 19PS Ch. 5.3 - Simplify the expressions in Problems 9-37. a....Ch. 5.3 - Prob. 21PS Ch. 5.3 - Prob. 22PS Ch. 5.3 - Prob. 23PS Ch. 5.3 - Prob. 24PS Ch. 5.3 - Prob. 25PS Ch. 5.3 - Prob. 26PS Ch. 5.3 - Prob. 27PS Ch. 5.3 - Prob. 28PS Ch. 5.3 - Prob. 29PS Ch. 5.3 - Prob. 30PS Ch. 5.3 - Prob. 31PS Ch. 5.3 - Prob. 32PS Ch. 5.3 - Prob. 33PS Ch. 5.3 - Prob. 34PS Ch. 5.3 - Prob. 35PS Ch. 5.3 - Prob. 36PS Ch. 5.3 - Prob. 37PS Ch. 5.3 - Prob. 38PS Ch. 5.3 - Prob. 39PS Ch. 5.3 - Prob. 40PS Ch. 5.3 - Prob. 41PS Ch. 5.3 - Prob. 42PS Ch. 5.3 - Prob. 43PS Ch. 5.3 - Prob. 44PS Ch. 5.3 - Prob. 45PS Ch. 5.3 - Prob. 46PS Ch. 5.3 - Prob. 47PS Ch. 5.3 - Prob. 48PS Ch. 5.3 - Prob. 49PS Ch. 5.3 - Prob. 50PS Ch. 5.3 - Prob. 51PS Ch. 5.3 - Prob. 52PS Ch. 5.3 - Perform the indicated operations. Let k be a...Ch. 5.3 - Perform the indicated operations. Let k be a...Ch. 5.3 - a. State the commutative property. b. Is ...Ch. 5.3 - Prob. 56PS Ch. 5.3 - Prob. 57PS Ch. 5.3 - Prob. 58PS Ch. 5.3 - Multiply 1,234,5679,999,999 a. using a calculator...Ch. 5.3 - Prob. 60PS Ch. 5.4 - IN YOUR OWN WORDS What does it mean for a fraction...Ch. 5.4 - IN YOUR OWN WORDS Describe the process for...Ch. 5.4 - Prob. 3PS Ch. 5.4 - Prob. 4PS Ch. 5.4 - IN YOUR OWN WORDS Use algebra to show where the...Ch. 5.4 - IN YOUR OWN WORDS Use algebra to show where the...Ch. 5.4 - Completely reduce the fractions in Problems 7-18....Ch. 5.4 - Completely reduce the fractions in Problems 7-18....Ch. 5.4 - Completely reduce the fractions in Problems 7-18....Ch. 5.4 - Completely reduce the fractions in Problems 7-18....Ch. 5.4 - Completely reduce the fractions in problem 7-18....Ch. 5.4 - Completely reduce the fractions in problem 7-18....Ch. 5.4 - Completely reduce the fractions in problem 7-18....Ch. 5.4 - Completely reduce the fractions in problem 7-18....Ch. 5.4 - Completely reduce the fractions in problem 7-18....Ch. 5.4 - Completely reduce the fractions in problem 7-18....Ch. 5.4 - Completely reduce the fractions in problem 7-18....Ch. 5.4 - Completely reduce the fractions in problem 7-18....Ch. 5.4 - Perform the indicated operations in problems...Ch. 5.4 - Perform the indicated operations in problems...Ch. 5.4 - Perform the indicated operations in problems...Ch. 5.4 - Perform the indicated operations in problems...Ch. 5.4 - Perform the indicated operations in problems...Ch. 5.4 - Prob. 24PS Ch. 5.4 - Prob. 25PS Ch. 5.4 - Prob. 26PS Ch. 5.4 - Prob. 27PS Ch. 5.4 - Prob. 28PS Ch. 5.4 - Prob. 29PS Ch. 5.4 - Prob. 30PS Ch. 5.4 - Prob. 31PS Ch. 5.4 - Prob. 32PS Ch. 5.4 - Prob. 33PS Ch. 5.4 - Prob. 34PS Ch. 5.4 - Prob. 35PS Ch. 5.4 - Prob. 36PS Ch. 5.4 - Prob. 37PS Ch. 5.4 - Prob. 38PS Ch. 5.4 - Prob. 39PS Ch. 5.4 - Prob. 40PS Ch. 5.4 - Prob. 41PS Ch. 5.4 - Prob. 42PS Ch. 5.4 - Prob. 43PS Ch. 5.4 - Prob. 44PS Ch. 5.4 - Perform the indicated operations in problems...Ch. 5.4 - Perform the indicated operations in problems...Ch. 5.4 - Prob. 47PS Ch. 5.4 - Prob. 48PS Ch. 5.4 - Prob. 49PS Ch. 5.4 - Prob. 50PS Ch. 5.4 - Prob. 51PS Ch. 5.4 - Prob. 52PS Ch. 5.4 - Prob. 53PS Ch. 5.4 - Prob. 54PS Ch. 5.4 - Prob. 55PS Ch. 5.4 - Prob. 56PS Ch. 5.4 - Prob. 57PS Ch. 5.4 - Prob. 58PS Ch. 5.4 - Prob. 59PS Ch. 5.4 - Prob. 60PS Ch. 5.5 - Prob. 1PS Ch. 5.5 - Prob. 2PS Ch. 5.5 - Prob. 3PS Ch. 5.5 - Prob. 4PS Ch. 5.5 - Prob. 5PS Ch. 5.5 - Prob. 6PS Ch. 5.5 - Prob. 7PS Ch. 5.5 - Prob. 8PS Ch. 5.5 - Prob. 9PS Ch. 5.5 - Prob. 10PS Ch. 5.5 - Prob. 11PS Ch. 5.5 - Prob. 12PS Ch. 5.5 - Prob. 13PS Ch. 5.5 - Prob. 14PS Ch. 5.5 - Prob. 15PS Ch. 5.5 - Prob. 16PS Ch. 5.5 - Prob. 17PS Ch. 5.5 - Prob. 18PS Ch. 5.5 - Prob. 19PS Ch. 5.5 - Prob. 20PS Ch. 5.5 - Prob. 21PS Ch. 5.5 - Prob. 22PS Ch. 5.5 - Prob. 23PS Ch. 5.5 - Prob. 24PS Ch. 5.5 - Prob. 25PS Ch. 5.5 - Prob. 26PS Ch. 5.5 - Prob. 27PS Ch. 5.5 - Prob. 28PS Ch. 5.5 - Prob. 29PS Ch. 5.5 - Prob. 30PS Ch. 5.5 - Prob. 31PS Ch. 5.5 - Prob. 32PS Ch. 5.5 - Prob. 33PS Ch. 5.5 - Prob. 34PS Ch. 5.5 - Prob. 35PS Ch. 5.5 - Prob. 36PS Ch. 5.5 - Prob. 37PS Ch. 5.5 - Prob. 38PS Ch. 5.5 - If a carpenter wants to make sure that the corner...Ch. 5.5 - Prob. 40PS Ch. 5.5 - An antenna is to be erected and held by guy wires....Ch. 5.5 - Prob. 42PS Ch. 5.5 - Prob. 43PS Ch. 5.5 - Prob. 44PS Ch. 5.5 - Prob. 45PS Ch. 5.5 - Prob. 46PS Ch. 5.5 - Prob. 47PS Ch. 5.5 - Prob. 48PS Ch. 5.5 - Prob. 49PS Ch. 5.5 - Prob. 50PS Ch. 5.5 - Prob. 51PS Ch. 5.5 - Prob. 52PS Ch. 5.5 - Prob. 53PS Ch. 5.5 - Prob. 54PS Ch. 5.5 - Prob. 55PS Ch. 5.5 - Prob. 56PS Ch. 5.5 - Prob. 57PS Ch. 5.5 - Prob. 58PS Ch. 5.5 - Prob. 59PS Ch. 5.5 - Prob. 60PS Ch. 5.6 - Prob. 1PS Ch. 5.6 - Prob. 2PS Ch. 5.6 - Prob. 3PS Ch. 5.6 - Prob. 4PS Ch. 5.6 - Prob. 5PS Ch. 5.6 - Prob. 6PS Ch. 5.6 - Prob. 7PS Ch. 5.6 - Tell whether each number is an element of N a...Ch. 5.6 - Prob. 9PS Ch. 5.6 - Prob. 10PS Ch. 5.6 - Express each of the numbers in Problems 9-12 as a...Ch. 5.6 - Prob. 12PS Ch. 5.6 - Prob. 13PS Ch. 5.6 - Prob. 14PS Ch. 5.6 - Prob. 15PS Ch. 5.6 - Prob. 16PS Ch. 5.6 - Prob. 17PS Ch. 5.6 - Prob. 18PS Ch. 5.6 - Prob. 19PS Ch. 5.6 - Prob. 20PS Ch. 5.6 - Prob. 21PS Ch. 5.6 - Prob. 22PS Ch. 5.6 - Prob. 23PS Ch. 5.6 - Prob. 24PS Ch. 5.6 - Prob. 25PS Ch. 5.6 - Carry out the operations with decimal forms in...Ch. 5.6 - Prob. 27PS Ch. 5.6 - Prob. 28PS Ch. 5.6 - Prob. 29PS Ch. 5.6 - Prob. 30PS Ch. 5.6 - Prob. 31PS Ch. 5.6 - Prob. 32PS Ch. 5.6 - Prob. 33PS Ch. 5.6 - Prob. 34PS Ch. 5.6 - Prob. 35PS Ch. 5.6 - Prob. 36PS Ch. 5.6 - Prob. 37PS Ch. 5.6 - Prob. 38PS Ch. 5.6 - Prob. 39PS Ch. 5.6 - Prob. 40PS Ch. 5.6 - Prob. 41PS Ch. 5.6 - Prob. 42PS Ch. 5.6 - Prob. 43PS Ch. 5.6 - Prob. 44PS Ch. 5.6 - Prob. 45PS Ch. 5.6 - Prob. 46PS Ch. 5.6 - Prob. 47PS Ch. 5.6 - Prob. 48PS Ch. 5.6 - Prob. 49PS Ch. 5.6 - Prob. 50PS Ch. 5.6 - Prob. 51PS Ch. 5.6 - Prob. 52PS Ch. 5.6 - Prob. 53PS Ch. 5.6 - Prob. 54PS Ch. 5.6 - Prob. 55PS Ch. 5.6 - Let be an arbitrary operation in Problems 52-59....Ch. 5.6 - Let be an arbitrary operation in Problems 52-59....Ch. 5.6 - Prob. 58PS Ch. 5.6 - Prob. 59PS Ch. 5.6 - Prob. 60PS Ch. 5.7 - Level 1. IN YOUR OWN WORDS. What do we mean by...Ch. 5.7 - Prob. 2PS Ch. 5.7 - Prob. 3PS Ch. 5.7 - Prob. 4PS Ch. 5.7 - Prob. 5PS Ch. 5.7 - Prob. 6PS Ch. 5.7 - Level 1. Perform the indicated operations in...Ch. 5.7 - Prob. 8PS Ch. 5.7 - Prob. 9PS Ch. 5.7 - Prob. 10PS Ch. 5.7 - Prob. 11PS Ch. 5.7 - Prob. 12PS Ch. 5.7 - Prob. 13PS Ch. 5.7 - Prob. 14PS Ch. 5.7 - Prob. 15PS Ch. 5.7 - Prob. 16PS Ch. 5.7 - Prob. 17PS Ch. 5.7 - Prob. 18PS Ch. 5.7 - Prob. 19PS Ch. 5.7 - Prob. 20PS Ch. 5.7 - Prob. 21PS Ch. 5.7 - Prob. 22PS Ch. 5.7 - Prob. 23PS Ch. 5.7 - Prob. 24PS Ch. 5.7 - Prob. 25PS Ch. 5.7 - Prob. 26PS Ch. 5.7 - Prob. 27PS Ch. 5.7 - Prob. 28PS Ch. 5.7 - Prob. 29PS Ch. 5.7 - Prob. 30PS Ch. 5.7 - Prob. 31PS Ch. 5.7 - Prob. 32PS Ch. 5.7 - Prob. 33PS Ch. 5.7 - Prob. 34PS Ch. 5.7 - Prob. 35PS Ch. 5.7 - Level 2. If you know that your aunt in Problem 34...Ch. 5.7 - Prob. 37PS Ch. 5.7 - Prob. 38PS Ch. 5.7 - Prob. 39PS Ch. 5.7 - Prob. 40PS Ch. 5.7 - Prob. 41PS Ch. 5.7 - Prob. 42PS Ch. 5.7 - Prob. 43PS Ch. 5.7 - Prob. 44PS Ch. 5.7 - Prob. 45PS Ch. 5.7 - Prob. 46PS Ch. 5.7 - Prob. 47PS Ch. 5.7 - Prob. 48PS Ch. 5.7 - Prob. 49PS Ch. 5.7 - Prob. 50PS Ch. 5.7 - Prob. 51PS Ch. 5.7 - Prob. 52PS Ch. 5.7 - Prob. 53PS Ch. 5.7 - Prob. 54PS Ch. 5.7 - Prob. 55PS Ch. 5.7 - Prob. 56PS Ch. 5.7 - Prob. 57PS Ch. 5.7 - Prob. 58PS Ch. 5.7 - Prob. 59PS Ch. 5.7 - Prob. 60PS Ch. 5.8 - Prob. 1PS Ch. 5.8 - Prob. 2PS Ch. 5.8 - Prob. 3PS Ch. 5.8 - Prob. 4PS Ch. 5.8 - Prob. 5PS Ch. 5.8 - Prob. 6PS Ch. 5.8 - Prob. 7PS Ch. 5.8 - Prob. 8PS Ch. 5.8 - Prob. 9PS Ch. 5.8 - Number the letters of the alphabet from 1 to 26;...Ch. 5.8 - Prob. 11PS Ch. 5.8 - Prob. 12PS Ch. 5.8 - Prob. 13PS Ch. 5.8 - Prob. 14PS Ch. 5.8 - Prob. 15PS Ch. 5.8 - Prob. 16PS Ch. 5.8 - Prob. 17PS Ch. 5.8 - Prob. 18PS Ch. 5.8 - Prob. 19PS Ch. 5.8 - Prob. 20PS Ch. 5.8 - Prob. 21PS Ch. 5.8 - Prob. 22PS Ch. 5.8 - Prob. 23PS Ch. 5.8 - Prob. 24PS Ch. 5.8 - Prob. 25PS Ch. 5.8 - Prob. 26PS Ch. 5.8 - Prob. 27PS Ch. 5.8 - Prob. 28PS Ch. 5.8 - Prob. 29PS Ch. 5.8 - Prob. 30PS Ch. 5.8 - Prob. 31PS Ch. 5.8 - Give the decoding key for the encoding keys in...Ch. 5.8 - Prob. 33PS Ch. 5.8 - Prob. 34PS Ch. 5.8 - Prob. 35PS Ch. 5.8 - Prob. 36PS Ch. 5.8 - Prob. 37PS Ch. 5.8 - Prob. 38PS Ch. 5.8 - Prob. 39PS Ch. 5.8 - Use Figure 5.25 to encode or decode the messages...Ch. 5.8 - Prob. 41PS Ch. 5.8 - Prob. 42PS Ch. 5.8 - Prob. 43PS Ch. 5.8 - Prob. 44PS Ch. 5.8 - Prob. 45PS Ch. 5.8 - Prob. 46PS Ch. 5.8 - Prob. 47PS Ch. 5.8 - Prob. 48PS Ch. 5.8 - Prob. 51PS Ch. 5.8 - Prob. 52PS Ch. 5.8 - Prob. 53PS Ch. 5.8 - Prob. 54PS Ch. 5.8 - Prob. 55PS Ch. 5.8 - Prob. 56PS Ch. 5.8 - Prob. 57PS Ch. 5.8 - Prob. 58PS Ch. 5.8 - Prob. 59PS Ch. 5.8 - Prob. 60PS Ch. 5.CR - Prob. 1CR Ch. 5.CR - Prob. 2CR Ch. 5.CR - Prob. 3CR Ch. 5.CR - Prob. 4CR Ch. 5.CR - Reduce each fraction. If it is reduced, so state....Ch. 5.CR - Prob. 6CR Ch. 5.CR - Prob. 7CR Ch. 5.CR - Prob. 8CR Ch. 5.CR - Prob. 9CR Ch. 5.CR - Prob. 10CR Ch. 5.CR - Prob. 11CR Ch. 5.CR - Prob. 12CR Ch. 5.CR - Prob. 13CR Ch. 5.CR - Prob. 14CR Ch. 5.CR - Prob. 15CR Ch. 5.CR - Prob. 16CR Ch. 5.CR - Prob. 17CR Ch. 5.CR - Do You Weigh Too Much? In the United States, an...Ch. 5.CR - Prob. 19CR Ch. 5.CR - Prob. 20CR

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To Encode: The message “MATHEMATICS IS FUN.”

Solution Summary: The author explains that cryptography is the art of coding or decoding messages. The secret message is called cipher .