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Given a conditional statement [tex]p \rightarrow q[/tex], which statement is logically equivalent?

A. [tex]\sim p \rightarrow \sim q[/tex]

B. [tex]\sim q \rightarrow \sim p[/tex]

C. [tex]q \rightarrow p[/tex]

D. [tex]p \rightarrow \sim q[/tex]


Sagot :

To determine which statement is logically equivalent to a given conditional statement [tex]\( p \rightarrow q \)[/tex], we need to consider a few key concepts in logic: the contrapositive, the inverse, and the converse of a conditional statement.

1. Original Statement: [tex]\( p \rightarrow q \)[/tex]
- This translates to: "If [tex]\( p \)[/tex] is true, then [tex]\( q \)[/tex] is true".

2. Contrapositive: [tex]\( \sim q \rightarrow \sim p \)[/tex]
- This translates to: "If [tex]\( q \)[/tex] is not true, then [tex]\( p \)[/tex] is not true".
- A fundamental property in logic is that the contrapositive of a conditional statement is always logically equivalent to the original conditional statement.

3. Inverse: [tex]\( \sim p \rightarrow \sim q \)[/tex]
- This translates to: "If [tex]\( p \)[/tex] is not true, then [tex]\( q \)[/tex] is not true".
- The inverse is not logically equivalent to the original statement.

4. Converse: [tex]\( q \rightarrow p \)[/tex]
- This translates to: "If [tex]\( q \)[/tex] is true, then [tex]\( p \)[/tex] is true".
- The converse is not logically equivalent to the original statement either.

5. Other Option: [tex]\( p \rightarrow \sim q \)[/tex]
- This translates to: "If [tex]\( p \)[/tex] is true, then [tex]\( q \)[/tex] is not true".
- This statement changes the relationship between [tex]\( p \)[/tex] and [tex]\( q \)[/tex] and is not logically equivalent to the original statement.

Given these concepts, the statement that is logically equivalent to [tex]\( p \rightarrow q \)[/tex] is the contrapositive: [tex]\( \sim q \rightarrow \sim p \)[/tex].

Therefore, the correct choice is:

[tex]\[ \sim q \rightarrow \sim p \][/tex]

This corresponds to the second option from the given choices:

[tex]\[ \boxed{\sim q \rightarrow \sim p} \][/tex]
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