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The Northern Intercity Railway employs ticket inspectors to check that everyone travelling on a train has a valid ticket, and catch anyone trying to ride for free. Anyone caught without a ticket has to pay a $500 fine. In the last five years, not a single person has been caught without a valid ticket.

Linda: “That just shows that the ticket inspectors are a waste of time and money – they never catch anyone. The Railway should save the money, or employ them to do something more useful.”

Which one of the following sentences shows the mistake Linda has made?