Hello!
Simple question + looking for confirmation.
If a rule says: If Sarah is cool, she will go to the party with her sister; otherwise, she will not.
Sarah cool ---> Party with sister
~ Sarah Cool ---> ~ Party with sister
Yes? I read somewhere that this is like an 'if and only if' rule... can someone comment?
Their contrapositives:
~Party with sister ---> ~Sarah cool
Party with sister --> Sarah cool
Thanks so much for the explanation, YesManJr!
@jy-ping
In case anyone wants to practice with this rule in the Logical Reasoning section, PT63, S3, Q. 22 is excellent practice!