The Error in the Two Envelopes Paradox
  The "paradox" arises in the Two Envelopes Paradox from the incorrect formulation of the argument. The infomation given is misused and therefore the results are incorrect for the question asked. The key is to be clear on what question we are asking. We must make sure that the question that is asked is the question that is written down. 
Adom Giffin