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sufficient and necessary?

General questions relating to the LSAT or LSAT preparation.
 jgray
  • Posts: 41
  • Joined: Feb 13, 2015
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-  Tue Jan 12, 2016 10:45 am #21736
Can a person say, "x is sufficient and necessary"? Is that the same as A :dbl: B?
 Jon Denning
PowerScore Staff
  • PowerScore Staff
  • Posts: 907
  • Joined: Apr 11, 2011
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-  Tue Jan 12, 2016 12:50 pm #21741
Hey J,

Thanks for the question! That's absolutely correct: if a condition is both sufficient and necessary, then it creates a double arrow, :dbl:

For instance, if you read, "A occurs if, and only if, B occurs," then A and B are both sufficient and necessary for the other to happen. A if B gives you B :arrow: A, and A only if B gives you A :arrow: B. Together that's A :dbl: B.

I hope that helps!
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