EXAMPLE 2.3.12 SOLUTION

We start by symbolizing the argument.

Let p be the statement "You have jumper cables."

Let q be the statement "Our date is cancelled."

Let r be the statement "You have a credit card."

 

The argument has this symbolic form:

 

 

Now we make a truth table having a column for each premise and for the conclusion.

Notice that in the first row, every premise is true while the conclusion is false. This indicates that the argument is INVALID.