Query failed: connection to 172.31.3.4:9312 failed (errno=111, msg=Connection refused). Sufficient and necessary / denying and affirming - 7Sage Forum

Sufficient and necessary / denying and affirming

SashaSevySashaSevy Live Member
in Logical Reasoning 10 karma

I just want to confirm my understanding on this.

Are these true?

If sufficient fails then no valid conclusions about the necessary condition, but if sufficient satisfied or affirmed then it triggers necessary, hence we can have a valid conclusion.
If necessary fails then it would trigger the sufficient, hence we can have a valid conclusion, but if necessary satisfied or affirmed then no valid conclusion.

and also whats the best way to memorize this? lol

Comments

  • annabellouise.jonesannabellouise.jones Core Member
    22 karma

    Yes, you got it! Sufficient satisfied -> affirm necessary condition. Necessary failed -> fail sufficient condition. Maybe you can remember it by what triggers the rule - use the acronym SS (sufficient satisfied) is good and then necessary triggers the rule in the opposite way (failed) so NF good also.

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