Assume the statement " if P, then Q." is true.
Based on this assumption , which of the following must be true ?
A. if Q , then P.
B. If P , then not Q.
C.If not P , then not Q.
D. if not Q , then not P.

Question

Assume the statement " if P, then Q." is true. 
Based on this assumption , which of the following must be true ? 
A. if Q , then P.
B. If P , then not Q.
C.If not P , then not Q.
D. if not Q , then not P.

anonymous · Answer

A

anonymous · Answer

A is true

anonymous · Answer

not at all

anonymous · Answer

a statement is equivalent to its "contra-positive"
the contra-positive of "if P then Q" is "if not Q, then not P"

anonymous · Answer

yeah...what satellite said. And nice name btw.

anonymous · Answer

Really ?! thank you sooooo much! & thanks ;*  @hackYou