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Select all the correct answers.

A number is negative if and only if it is less than 0.

[tex] p: \text{A number is negative.} [/tex]

[tex] q: \text{A number is less than 0.} [/tex]

Which represents the inverse of this statement? Is the inverse true or false?

A. [tex] \sim p \leftrightarrow \sim q [/tex]
B. The inverse of the statement is false.
C. The inverse of the statement is true.
D. [tex] \sim q \rightarrow \sim p [/tex]
E. [tex] q \leftrightarrow p [/tex]
F. [tex] q \rightarrow p [/tex]
G. The inverse of the statement is sometimes true and sometimes false.


Sagot :

To determine which statements are correct, let's proceed step-by-step:

1. Understanding the Original Statement:
- The original statement is: "A number is negative if and only if it is less than 0."
- In logical terms, this is [tex]\( p \leftrightarrow q \)[/tex], where:
- [tex]\( p \)[/tex]: A number is negative.
- [tex]\( q \)[/tex]: A number is less than 0.

2. Finding the Inverse:
- The inverse of the statement [tex]\( p \leftrightarrow q \)[/tex] is [tex]\( \sim p \leftrightarrow \sim q \)[/tex].
- [tex]\( \sim p \)[/tex]: A number is not negative.
- [tex]\( \sim q \)[/tex]: A number is not less than 0.
- Hence, the inverse statement is: "A number is not negative if and only if it is not less than 0."
- This can be restated as: "A number is non-negative if and only if it is zero or positive."

3. Evaluating the Truth of the Inverse:
- To determine whether the inverse statement is true, let's examine the conditions:
- If a number is non-negative ([tex]\(\sim p\)[/tex]), it must be either 0 or positive ([tex]\(\sim q\)[/tex]). This is true.
- If a number is zero or positive ([tex]\(\sim q\)[/tex]), it must be non-negative ([tex]\(\sim p\)[/tex]). This is also true.

Therefore, the inverse statement [tex]\( \sim p \leftrightarrow \sim q \)[/tex] is always true.

4. Matching the Correct Answers:
- "The inverse of the statement is true."
- [tex]\( \sim p \leftrightarrow \sim q \)[/tex]

Therefore, the correct answers to the given question are:
- [tex]\( \sim p \leftrightarrow \sim q \)[/tex]
- The inverse of the statement is true.