Chapter 1.5, Problem 18E

In Exercises $11-20$, use a truth table to determine the validity of the argument specified. If the argument is invalid, interpret the specific circumstances that cause it to be invalid.

the argument in Exercise 8

8. $\begin{array}{l}p:\text{A person knows CPR}\text{.}\\ q:\text{A person is a paramedic}\text{.}\\ r:\text{A person is David Lee Roth}\text{.}\end{array}\}Usethesesymbols.$

1. Knowing CPR is necessary for being a paramedic.
2. David Lee Roth is a paramedic.
Therefore, David Lee Roth knows CPR.

HINT: Hypothesis 2 can be symbolized as $r\wedge q$.