The problem asks when the logical implication $p \rightarrow q$ is considered true. We are given 5 options and need to choose the correct one.

Discrete MathematicsLogicTruth TablesImplication
2025/6/4

1. Problem Description

The problem asks when the logical implication pqp \rightarrow q is considered true. We are given 5 options and need to choose the correct one.

2. Solution Steps

The implication pqp \rightarrow q is read as "if pp, then qq". Its truth table is as follows:
| p | q | p -> q |
|---|---|--------|
| T | T | T |
| T | F | F |
| F | T | T |
| F | F | T |
From the truth table, we can see that pqp \rightarrow q is true in all cases except when pp is true and qq is false.
Option (1) states "Only when both p and q are true". This is incorrect because pqp \rightarrow q is also true when p is false.
Option (2) states "Only when both p and q are false". This is incorrect as well, because pqp \rightarrow q is true when both are true, and when pp is false and qq is true.
Option (3) states "Provided p is false or q is true (or both)". This matches the truth table where pqp \rightarrow q is true when p is false, q is true, or both.
Option (4) states "Provided p is true and q is true". This is incorrect because the implication is also true when p is false.
Option (5) states "Provided p is true or q is false (or both)". This is incorrect because when p is true and q is true, the implication should be true, but it doesn't meet this condition.

3. Final Answer

(3) Provided p is false or q is true (or both)

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