<PRE><B>Question 616188</B>
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Argument is valid.  Contrapositive always has the same truth value as the original statement, i.e. if &quot;if p then q&quot; is valid, then &quot;if not q then not p&quot; is also valid.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
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