Sufficient & Necessary Questions - - Question 25

Reasonable people adapt themselves to the world; unreasonable people persist in trying to adapt the world to themselv...

Harper-Anderson February 18, 2020

"Only"

In the Sufficient and Necessary video, "only" is said to indicate a necessary condition, but in the video explanation of this question, she uses "only" as a sufficient condition. Could you explain this? Thank you!

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shunhe February 18, 2020

Hi @Harper-Anderson,

Thanks for the question! I assume you’re talking about answer choice (B). Reading it carefully, we see that it reads “if there are only reasonable people, there cannot be progress.” In other words, the conditional logic word here is still “if,” it doesn’t matter that “only” happens to appear after it. “Only” matters when we see things like “Only if” X or “only people” who X, and although we see that syntactically, it’s within the logic of a “if only reasonable people, then there cannot be progress.” In other words

Only reasonable people —> Cannot be progress

Because we can see here that we’re not saying anything about the reasonable people themselves. We’re saying something about a world in which there are only reasonable people.

Hope this helps! Feel free to ask any other questions that you might have.

CristianStanley May 21, 2021

can you please re type the answer to this? This is what your answer explanation reads: I assume you’re talking about answer choice (B). Reading it carefully, we see that it reads “if there are only reasonable people, there cannot be progress.” In other words, the conditional logic word here is still “if,” it doesn’t matter that “only” happens to appear after it. “Only” matters when we see things like “Only if” X or “only people” who X, and although we see that syntactically, it’s within the logic of a “if only reasonable people, then there cannot be progress.” In other words


Also, is the a rule for when keywords that signify different conditions come after each other?
Is there a rule that says that if two keywords are in the same sentence and one represents a N.C and the other represents a S.F, that you pick the first word that appears.
For example, in option B- "If the only reasonable.."
If (represents S.C) and the only (represents N.C) show up in the same sentence, but we use the S.C. Is there a rule that says to always use the first word? How do I know which condition to use when two keywords are in a sentence so closely?