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01 Aug 2006, 19:19
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At Food World Supermarket, built in 1975, the number of successful thefts has risen
dramatically in the last few months. Food World has a reliable electronic security system at all
customer exit doors, and this system is always in operation. Therefore, the thefts must have
been committed by people who used exits other than the regular customer exit doors.
Which of the following is an assumption that would make the conclusion above logically correct?
A. If a surveillance system is installed in a supermarket, it is always equipped at every
possible exit.
B. If an employee so wishes, he is allowed to leave through an exit that is not monitored by
surveillance equipment.
C. If a store has a reliable security system, it is impossible to pass through the system
undetected.
D. If a supermarket was built before 1980, it often has exits that cannot be equipped with
electronic surveillance.
E. If a store has a reliable electronic security system but is still experiencing a rise in theft, it
must be the case that the employees are stealing.
dramatically in the last few months. Food World has a reliable electronic security system at all
customer exit doors, and this system is always in operation. Therefore, the thefts must have
been committed by people who used exits other than the regular customer exit doors.
Which of the following is an assumption that would make the conclusion above logically correct?
A. If a surveillance system is installed in a supermarket, it is always equipped at every
possible exit.
B. If an employee so wishes, he is allowed to leave through an exit that is not monitored by
surveillance equipment.
C. If a store has a reliable security system, it is impossible to pass through the system
undetected.
D. If a supermarket was built before 1980, it often has exits that cannot be equipped with
electronic surveillance.
E. If a store has a reliable electronic security system but is still experiencing a rise in theft, it
must be the case that the employees are stealing.
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01 Aug 2006, 19:22
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ATTN EXPLANATION BELOW. PLEASE READ ONLY AFTER YOU VOTED AND SEE IF IT MAKES SENSE
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(A) plainly can't be assumed, since the author is concluding that the thefts took place at
unequipped doors. (B) and (E) both play off the same red herring: employee theft. the
issue is where the thefts are occurring, not who is committing them. The author seems to
think that non-customer exit doors are the problem, but there's no need to assume that
these can't be equipped with a surveillance system.
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(A) plainly can't be assumed, since the author is concluding that the thefts took place at
unequipped doors. (B) and (E) both play off the same red herring: employee theft. the
issue is where the thefts are occurring, not who is committing them. The author seems to
think that non-customer exit doors are the problem, but there's no need to assume that
these can't be equipped with a surveillance system.
01 Aug 2006, 19:30
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I have chosen B. If an employee so wishes, he is allowed to leave through an exit that is not monitored by surveillance equipment.
I mean the evidence says nothing about having security systems installed everywhere! Just customer doors. In order to use C. (correct answer) shouldn't we see evidence that system is installed on ALL doors? I know explanation says we shouldn't assume that it wasn't installed on employee doors, but WHY should we assume that it was. The text specificially mentions customer doors, it says nothing of employee doors. If I shouldn't assume it wasn't installed there, I shouldn't assume that it was.
mistake again 
