SOLUTION: Proof for: P -> Q Therefore ~Q -> ~P

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Question 474140: Proof for:
P -> Q Therefore ~Q -> ~P
Answer by Edwin McCravy(20056) About Me  (Show Source):
You can put this solution on YOUR website!
 P -> Q Therefore ~Q -> ~P

P  Q  (P -> Q)  ~Q  ~P  (~Q->~P) 
T  T     T       F   F      T
T  F     F       T   F      F
F  T     T       F   T      T
F  F     T       T   T      T

They have the same truth table TFTT



Edwin