In Exercises 15-42, translate each argument into symbolic form. Then determine whether the argument is valid or invalid. You may use a truth table or, if, applicable, compare the argument’s symbolic form to a standard valid or invalid form. (You can ignore difference in past, present, and future tense.) If some journalists learn about the invasion, the newspapers will print the news. If the newspapers print the news, the invasion will not be a secret. The invasion was a secret . ∴ No journalists learned about the invasion .
In Exercises 15-42, translate each argument into symbolic form. Then determine whether the argument is valid or invalid. You may use a truth table or, if, applicable, compare the argument’s symbolic form to a standard valid or invalid form. (You can ignore difference in past, present, and future tense.) If some journalists learn about the invasion, the newspapers will print the news. If the newspapers print the news, the invasion will not be a secret. The invasion was a secret . ∴ No journalists learned about the invasion .
In Exercises 15-42, translate each argument into symbolic form. Then determine whether the argument is valid or invalid. You may use a truth table or, if, applicable, compare the argument’s symbolic form to a standard valid or invalid form. (You can ignore difference in past, present, and future tense.)
If some journalists learn about the invasion, the newspapers will print the news.
If the newspapers print the news, the invasion will not be a secret.
The
invasion
was
a
secret
.
∴
No
journalists learned about the invasion
.
Let the universal set be whole numbers 1
through 20 inclusive. That is,
U = {1, 2, 3, 4, . . ., 19, 20}. Let A, B, and C
be subsets of U.
Let A be the set of all prime numbers:
A = {2, 3, 5, 7, 11, 13, 17, 19}
Let B be the set of all odd numbers:
B = {1,3,5,7, . . ., 17, 19}
Let C be the set of all square numbers:
C = {1,4,9,16}
Chapter 3 Solutions
Thinking Mathematically plus NEW MyLab Math with Pearson eText -- Access Card Package (6th Edition)
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