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## Homework Statement

Create a truth table for ((P->Q) == (Q->P))

## Homework Equations

## The Attempt at a Solution

http://www.freeimagehosting.net/newuploads/94ldj.png

I've had two quizes with problems just like this marked wrong in my college logic course. I confronted the professor about it and he just told me to study the truth tables. I'm very confused as to why this is wrong, because I've taken a discreet math course previously.