p means 'Smith has installed central heating'
q means 'Smith has sold his car'
r means 'Smith has paid his mortage'.
Therefore, (p q) r
means 'Smith has not paid his mortage or, if he (Smith) has installed
central heating, then he has sold his car.'
How does the meaning of the formula (p q) r change if we omit all parentheses?
Back to Question. Next Question.
Incorrect Answer.
q) 
r
means 'Smith has not paid his mortage or, if he (Smith) has installed
central heating, then he has sold his car.'