W4 ALS461_Basic Logical Concepts (Exercise 3.3 1-10)

1. Because x = 3 and y = 5, then x + y = 8.

1. According to the New York Public Library Desk Reference, the pop-up toaster was invented by Charles Strite in 1927. The New York Public Library Desk Reference is a highly reliable reference work. Therefore, it’s reasonable to believe that Charles Strite did invent the pop-up toaster in 1927.

1. Seventy-three percent of Ft. Gibson residents enjoy fishing. Lonnie is a Ft. Gibson resident. So, it’s likely that Lonnie enjoys fishing.

1. Either Elmo will win the election or Schlomo will win the election. But Elmo won’t win the election. Therefore, Schlomo will win the election.

1. The burglar is tall and thin. Duncan is short and fat. Obviously, therefore, Duncan isn’t the burglar.

1. There are no visible signs of forced entry. It seems certain, therefore, that the burglar had a key.

The sign says it is 7 miles to Lake Lily. Therefore, it is approximately

7. 7 miles to Lake Lily.

7. Joan is an extrovert. It follows that she is outgoing.

7. All inductive generalizations are inductive. Some inductive generalizations are unreliable. Therefore, some inductive arguments are unreliable.

If it rains, the game will be postponed until next Saturday. According to the National Weather Service, there’s a 90 percent chance of rain. Therefore, probably the game will be postponed until next Saturday.