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#10 - All of John's friends say they know someone who has

Robert Carroll
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Posts: 488
Joined: Fri Dec 06, 2013 7:18 am
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mrcheese,

"It is quite certain" entails that it is true. So John is not the only person who knows no one who has smoked and is fit. But all his friends say the opposite. So at least one of his friends is saying something that is not true. That is what answer choice (E) says.

Robert Carroll