Me and a student were studying when we got a bit confused over when to negate the sufficient. Consider these two examples:
If you are a rabbit you are white.
R->W
No rabbit is white.
is it /R->W or R-> / W
I feel like the second one explains If you are a rabbit you are not white and the first one says no rabbit is white. Can somebody for the last time explain when the sufficient gets negated and when the necessary? something concrete to remember would be much appreciated, I know this might sounds basic but after awhile you just get confused...