Chapter 1.5, Problem 17E

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 7

7. $\begin{array}{l}p:\text{A person knows Morse code}\text{.}\\ q:\text{A person operates a telegraph}\text{.}\\ r:\text{A person is Nikola Tesla}\end{array}\}Usethesesymbols.$

1. Knowing Morse code is necessary for operating a telegraph.
2. Nikola Tesla knows Morse code.
Therefore, Nikola Tesla operates a telegraph.

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