## Thinking Mathematically (6th Edition)

Published by Pearson

# Chapter 3 - Logic - 3.3 Truth Tables for Negation, Conjunction and Disjunction - Exercise Set 3.3 - Page 148: 36

#### Answer

$\begin{array}{llllll} p & q & \sim q & p\vee\sim q & p\vee q & ( p\vee\sim q)\wedge(p\vee q)\\ \hline T & T & F & T & T & T\\ T & F & T & T & T & T\\ F & T & F & F & T & F\\ F & F & T & T & F & F \end{array}$

#### Work Step by Step

Set up a truth table for two inputs, p and q: $\begin{array}{llll} p & q & ... & ...\\ \hline T & T & & \\ T & F & & \\ F & T & & \\ F & F & & \end{array}$ In the next column (3rd) , use the negation table for $\sim q$ $\begin{array}{lllll} p & q & \sim q & & \\ \hline T & T & F & & \\ T & F & T & & \\ F & T & F & & \\ F & F & T & & \end{array}$ Next column: $p\vee\sim q$ (disjunction, inputs: columns 1 and 3) $\begin{array}{lllll} p & q & \sim q & p\vee\sim q & \\ \hline T & T & F & T & \\ T & F & T & T & \\ F & T & F & F & \\ F & F & T & T & \end{array}$ Next column: $p\vee q$ (disjunction, inputs: columns 1 and 2) $\begin{array}{lllll} p & q & \sim q & p\vee\sim q & p\vee q\\ \hline T & T & F & T & T\\ T & F & T & T & T\\ F & T & F & F & T\\ F & F & T & T & F \end{array}$ Final column: $( p\vee\sim q)\wedge(p\vee q)$ (conjunction, inputs: columns 4 and 5) $\begin{array}{llllll} p & q & \sim q & p\vee\sim q & p\vee q & ( p\vee\sim q)\wedge(p\vee q)\\ \hline T & T & F & T & T & T\\ T & F & T & T & T & T\\ F & T & F & F & T & F\\ F & F & T & T & F & F \end{array}$

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