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Consider the argument: Attached
IS IT VALID OR INVALID?????????????????

Consider the argument: Attached IS IT VALID OR INVALID?????????????????-example-1
User Yjzhang
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1 Answer

1 vote

Answer: Invalid

Step-by-step explanation:

The conclusion should be
p \to r due to the hypothetical syllogism rule (similar to the transitive rule).

You can make a truth table to show that the premises
p \to q and
q \to r can both be true at the same time, but the conclusion
p \leftrightarrow q is false. Whenever you have all true premises and a false conclusion, then the argument is invalid. True premises must lead to a true conclusion.

User Thell
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