Incorrect Answer.
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
'If Smith has installed central heating, then he (Smith) has sold his car,
or he has paid his mortage.'
His bank will tell you right away that there is a crucial difference between
this sentence and the original one!
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