Use symbols to write the logical form of each argument given below, and thenuse a truth table to test the argument for validity.If the positive number is less than 2, then its square is not larger than 4.If square of number is larger than 4, then the number is not less than 2.∴ The positive number is not less than 2 and its square is not larger than 4
Question
Use symbols to write the logical form of each argument given below, and thenuse a truth table to test the argument for validity.If the positive number is less than 2, then its square is not larger than 4.If square of number is larger than 4, then the number is not less than 2.∴ The positive number is not less than 2 and its square is not larger than 4
Solution
The logical form of the argument can be written as follows:
Let's denote: P: The positive number is less than 2 Q: Its square is not larger than 4
The argument can then be written as:
- If P, then Q (If the positive number is less than 2, then its square is not larger than 4)
- If not Q, then not P (If square of number is larger than 4, then the number is not less than 2) ∴ Not P and Q (The positive number is not less than 2 and its square is not larger than 4)
Now, let's create a truth table to test the argument for validity:
| P | Q | If P, then Q | If not Q, then not P | Not P and Q |
|---|---|---|---|---|
| T | T | T | T | F |
| T | F | F | F | F |
| F | T | T | T | T |
| F | F | T | T | F |
From the truth table, we can see that the argument is not valid. The conclusion (Not P and Q) is not true in all cases where the premises (If P, then Q and If not Q, then not P) are true.
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