276. Thomas and Sam work every other day (Monday through Saturday).
Thomas and Sam never work together.
Uma, Victor and Winona work twice a week (Monday through Saturday), but never together.
Thomas and Victor cannot both work on the same day.
Winona never works on Mondays or Fridays.
If Winona is working on Tuesday, Wednesday or both, which of the following CANNOT be true?

277. A chef has to pick four fruits out of the following seven to make a fruit salad: figs, guavas, honeydews, kiwis, mangos, nectarines and papayas.
Papaya can be selected only if kiwi is selected.
Fig can be selected only if nectarine is selected.
Either mango or nectarine must be selected, but never both.
Either papaya or honeydew must be selected but never both.
If the salad does not contain kiwi, which one of the following fruits must be in the salad

278. Although the new cochleae manufactured by Medotech will cost more than twice as much as the cochlear implants now in use, Medotech implants should still be cost-effective. Not only will surgery and recovery time be reduced, but Medotech cochlear replacements should last longer, thereby reducing the need for further hospital stays. Which of the following must be studied in order to evaluate the argument presented above?

279. The best answer is C. To evaluate the argument it must be determined whether these savings will compensate for the increased cost. Therefore, study of the expected reduction in the need for further hospital stays is needed.

280. Wheat has more nutritional value than rye. But since oats have more nutritional value than rice, it follows that wheat has more nutritional value than rice. Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:

281. A famous painter has recently won a lawsuit against a major food manufacturer for commissioning a graphic designer to design the packaging of its chocolate chip cookies in the painter's distinctive style. As a result of the lawsuit, manufacturers will stop asking graphic artists to copy distinctive painting styles. Therefore, the cost of package design will rise because employing the services of known artists costs more than those of graphic designers that imitate their style. The conclusion above is based on which of the following assumptions?

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