1984

In "1984", what are the 3 slogans of the Party? Are they paradoxes (true in a sense) or simply contradictions (not true in any sense).

In the mind of the Party, they are not paradoxes.

"War is Peace." -This world is full of troubles, most of the time we don't even know what they are or where they are.  When we have an enemy in plain sight, we are confident of our ability to fight him.  Therefore, with that confidence we feel at peace.  We've taken action.  We are doing something.  In times of peace, we know there's an enemy somewhere....  On top of that, war brings often economic benefits (e.g. World War II bringing the country out of the Great Depression).

 "Freedom is Slavery." - When you are free, you are responsible for yourself.  No one will take care of you, look out for your welfare.  You are tied to the struggle to survive.  If the government provides for your needs, you are free to pursue other pleasures.

"Knowledge is Ignorance." -  As the saying goes, "The more you learn, the more you realize the less you know."  Without knowledge, you are freed from responsibility. "Ignorance is bliss."   So in a way, you can alos say "Ignorance is Freedom."